The Sea of Monsters · Garden Heights

Part 5

for The Sea of Monsters · Part 5 · Chapters 11–13

8 Parts40 min

What Happens in Part 5

The ironclad steams for the door into the Sea of Monsters, and Clarisse announces the price: a whirlpool on one side, a cliff of striking heads on the other. She runs at the whirlpool, pushes the boilers past what they can hold, and sends Tyson below to keep the engine together. The ship is dragged down and thrown back up, the heads come off the cliff for the crew, and Percy gets Annabeth into a lifeboat before the boiler lets go — leaving him in the water believing his brother has died with the ship. The two survivors wash up at C.C.’s spa, where a gracious host offers Annabeth a makeover and Percy a cold green drink that leaves him small, furred, and caged with guinea pigs who used to be pirates, because C.C. is the sorceress Circe. Annabeth breaks the spell with the multivitamins Hermes gave them, the freed pirates — Blackbeard among them — overrun the island, and the demigods escape aboard the Queen Anne’s Revenge. Sailing on, they must pass the Sirens: Percy seals his ears with wax and ties Annabeth to the mast at her own request, she cuts herself free and swims for the rock, and he hauls her down under the water where the song cannot follow. What she saw, she admits, was her parents together, Luke turned good again, and a rebuilt city raised from her own designs — and she names her fatal flaw out loud: pride.

What We Will Learn

Section	What you will practice
Vocabulary	Words for whirlpools, spells, and dangerous songs: maelstrom, enchantment, compulsion, hubris…
Literary Elements	Allusion to the Odyssey, the temptation scene, and a fatal flaw named out loud
Cross-Curricular	How sound travels underwater — why a voice carries for miles and how animals hunt by echo

Chapter Summary

Ch.	What happens
11	Clarisse Blows Up Everything — The ironclad drives for the door into the Sea of Monsters, and the door has a price: a whirlpool on one side, a cliff of striking heads on the other. Clarisse chooses to run at the whirlpool and orders the boilers pushed past what they can safely hold, while Tyson goes below to keep the straining engine together. The ship is dragged down and thrown back up, the heads come off the cliff for the crew, and Percy gets Annabeth into a lifeboat before the boiler lets go. He is thrown clear into the water believing his brother has gone down with the ship.
12	We Check In to C.C.’s Spa & Resort — The two survivors come ashore at a spotless island resort run by a gracious host who calls herself C.C. Annabeth is led away for a makeover; Percy is handed a cold green drink and wakes up small and furred in a hutch, one more pet among guinea pigs who were pirates a very long time ago. C.C. is the sorceress Circe. Annabeth breaks the spell with the multivitamins Hermes handed over as a gift, and the freed pirates — Blackbeard among them — overrun the spa while the two demigods escape aboard the Queen Anne’s Revenge.
13	Annabeth Tries to Swim Home — Sailing north, they must pass the Sirens. Percy seals his own ears with wax; Annabeth asks to be tied to the mast so that she can hear the song and live, and makes Percy promise not to untie her. She cuts the ropes with her knife and swims for the rock, and Percy dives after her and drags her down under the water, where the singing cannot follow. What the song showed her, she finally admits, was her parents together, Luke turned good again, and a rebuilt city raised from her own designs — and she names her fatal flaw out loud: pride.

Part 1

Vocabulary

Study 10 key words from Chapters 11–13, then answer each question.

📚Knowledge Bank · Words for Whirlpool and Song

Language · Danger and DesireThe vocabulary of these chapters divides neatly into two kinds of trouble. The first kind is physical and obvious. A maelstrom is a whirlpool violent enough to pull a ship under; treacherous water is water that hides its danger until a hull is already in it; peril is danger that has stopped being a possibility and turned into a fact. None of these words persuades anybody of anything. They simply describe what the sea can do to a crew that has run out of choices. The second kind of trouble works on the mind instead. To lure is to draw a person forward by promising exactly what that person already wants, and an enchantment is a spell that quietly edits what someone sees or believes. A compulsion is what a lure becomes once it is inside you: an urge too strong to argue with. Between the two families sits the old Greek word for whatever opens the door to both — the overreaching pride that convinces a sailor the rules will bend for him, which the Greeks called hubris.

maelstromn.Ch.11

A violent whirlpool strong enough to drag a ship under

“The maelstrom swallowed the ironclad and spat it back out.”

periln.Ch.11

Serious danger that is close at hand

“Clarisse steered toward the peril she thought she could survive.”

treacherousadj.Ch.11

Dangerous in a way that stays hidden until it is too late

“Calm water can be the most treacherous water of all.”

salvagev.Ch.11

To save something from a wreck or a disaster

“There was nothing left to salvage but a lifeboat and two demigods.”

enchantmentn.Ch.12

A spell that changes how a person looks or thinks

“The resort was an enchantment with towels and fruit drinks.”

lurev.Ch.12

To draw someone in by promising something they want

“A polite welcome can lure a guest further than any threat.”

compulsionn.Ch.13

An urge so strong that a person cannot resist it

“The song turned wanting into compulsion in a single verse.”

hubrisn.Ch.13

Overreaching pride that leads a person into ruin

“Annabeth names hubris as the flaw she has to watch in herself.”

resonatev.Ch.13

To keep sounding, filling a space with lasting vibration

“A low note can resonate through water for hundreds of miles.”

sonarn.Ch.11–13

A system that finds objects by sending out sound and timing the echo

“A dolphin hunts in the dark with sonar it was born with.”

ⓘ The vocabulary words in this list are selected to help you understand and complete this workbook. Some may not appear verbatim in the original novel.

1A violent whirlpool strong enough to drag a ship under is a ___.Ch.11

2‘Hubris’ means a modest, careful sense of your own limits.Ch.13

3To draw someone in by promising something they want is to ___.Ch.12

4An urge so strong that a person cannot resist it is a ___.Ch.13

5Fill in each blank with the correct word.Ch.11–13

Word choices:maelstromperilhubrissalvage- some words will not be used

The swallowed the ironclad and spat it back out.

Annabeth names her fatal flaw aloud, and the word for it is .

6‘Treacherous’ water is dangerous in a way that stays hidden until you are already in it.Ch.11

7To ‘resonate’ is to fall completely silent all at once.Ch.11–13

8A system that finds objects by sending out sound and timing the echo is ___.Ch.11–13

9Fill in the blanks with the correct words.Ch.11–13

Word choices:compulsionenchantmentluresonar- some words will not be used

A dolphin hunts in the dark using .

C.C. hides her island behind a comfortable .

10To save something from a wreck or a disaster is to ___ it.Ch.11

Part 2

Comprehension

Show you understood what happens in Chapters 11–13.

🔊Knowledge Bank · Why the Ocean Carries a Voice So Far

Physics · Sound in WaterSound is a pressure wave: a push handed from one particle to the next one over. How well that push travels depends on how tightly the particles are packed, which is why water beats air at nearly everything sound does. In seawater the wave moves about 1,500 meters per second, roughly four and a half times its speed in air, and it holds its energy far longer on the way. A shout outdoors dies inside a few hundred meters, while a low note in the deep ocean can cross hundreds of kilometers. There is even a natural sound pipe. About a kilometer down, temperature and pressure combine to give sound its slowest speed anywhere in the water column, and waves that stray out of that layer bend back into it instead of escaping, so the signal keeps going and going. Great whales sing low enough to use it. That is the fact behind every sea story about a voice heard from an impossible distance: underwater, distance is measured in sound.

1What does Clarisse choose when the ship reaches the entrance to the Sea of Monsters?Ch.11

2Where is Tyson when the ironclad is destroyed?Ch.11

3C.C. welcomes Annabeth with a makeover and hands Percy a drink that turns him into a guinea pig.Ch.12

4What are the guinea pigs in C.C.’s hutch?Ch.12

5Write the numbers 1–5 in the boxes to show the correct order of events in Chapters 11–13. Number 1 = what happens first.Ch.11–13

A cold green drink turns Percy into a guinea pig.
The boiler gives way and the ironclad is destroyed.
Percy drags Annabeth back down under the water.
Clarisse drives the ironclad straight at the whirlpool.
The freed pirates take over the island resort.

6Percy seals his own ears with wax so that the Sirens’ song cannot reach him.Ch.13

7What does Annabeth see while she is listening to the Sirens?Ch.13

8What does Annabeth name as her own fatal flaw?Ch.13

9Percy is certain from the moment of the explosion that Tyson survived.Ch.11

10How do Percy and Annabeth leave C.C.’s island?Ch.12

Part 3

Literary Elements

Understanding HOW and WHY Rick Riordan tells the story across Chapters 11–13.

🧠Knowledge Bank · The Song That Knows Your Name

Literary Craft · Allusion and TemptationRiordan builds these chapters out of borrowed parts, and he expects you to notice. A whirlpool, a cliff full of striking heads, a hostess who turns her guests into animals, a rock where voices sing: every one of them walks straight out of Homer, and a borrowed reference like that is called an allusion. An allusion is a bet on the reader. It costs a writer one sentence and pays back an entire older story, but only for the reader who recognizes the loan. The Sirens episode then shows what Riordan does with what he takes. A monster that attacks tests a hero’s strength, while a monster that offers tests a hero’s wants, which is why a temptation scene is really a piece of characterization. What the song plays for Annabeth — parents together, a friend turned good, a city rebuilt from her own drawings — is a portrait of her made out of pure longing. Then she names the weakness underneath it and hands the series a word to keep testing: hubris.

Allusion

Charybdis, Scylla, Circe, and the Sirens all step out of the Odyssey — Riordan borrows Homer’s hazards and hands them to a modern thirteen-year-old.

Temptation scene

The Sirens never threaten Annabeth; they offer her what she wants, which is why the wax and the ropes are aimed at the listener instead of the singer.

Fatal flaw

Annabeth names hers out loud — pride — turning an ancient Greek idea into a piece of self-knowledge the series will keep testing.

1Charybdis, Circe, and the Sirens all come out of Homer’s Odyssey. Borrowing them is ___.Ch.11–13

2Fill in each blank with the correct literary term.Ch.11–13

Word choices:allusionflawsonnetstanza- some words will not be used

Borrowing Homer’s monsters is an .

The pride Annabeth admits to is her fatal .

3Riordan has the Sirens show Annabeth her deepest wish instead of attacking her because ___.Ch.13

4The guinea-pig scene is purely a joke and tells readers nothing about Percy.Ch.12

5Percy sealing his ears while Annabeth is tied to the mast most directly echoes ___.Ch.13

6Naming Annabeth’s fatal flaw out loud does what for the rest of the series?Ch.13

7An allusion is a brief reference to another story that the reader is expected to recognize.Ch.11–13

8Fill in each blank with the correct literary term.Ch.11–13

Word choices:temptationironymetercouplet- some words will not be used

A scene built around a character’s deepest wish is a scene.

A spa that turns its guests into pets is a bitter kind of .

9Because Annabeth is clever, the story shows that intelligence by itself protects a person from the Sirens.Ch.13

10Across these three chapters Riordan builds nearly every danger the same way: ___.Ch.11–13

Part 4

Think Deeper

Four deeper challenges — no single-word recall. Read, weigh the evidence, and reason it out.

🐋Knowledge Bank · Seeing With Your Ears

Biology · EcholocationLight gives out fast underwater; a few hundred meters down there is nothing left to see by. Sound has no such limit, so several ocean animals gave up on eyes for hunting and built a whole sense out of echoes instead. A dolphin makes a burst of clicks in its nasal passages, focuses them forward through a fatty lens in its forehead called the melon, and then listens with its lower jaw, which carries the returning vibration straight to the inner ear. The timing does the arithmetic. An echo that comes back quickly means a near object, a slow echo means a far one, and the texture of the echo reports whether the thing ahead is rock, sand, or fish. Sperm whales run the same system at enormous power. Navies copied it and named it sonar, and survey ships now map the seafloor with it. Every one of these hunters is doing what a Siren does in reverse: instead of singing to be found, they sing in order to find.

Think back over these chapters. An iron ship drives straight at a hole in the ocean because the other door is a cliff full of teeth, and a boy who was told to stay out of the way goes below to hold the engine together with his hands. Later, on an island where everything smells expensive, a polite hostess hands a girl a mirror and a boy a cold drink, and only one of them is still a person an hour later. Then a ship passes a rock where voices are singing, and the song turns out to be no trick of noise at all — it is a trick of wanting, playing back to one listener the life she would trade almost anything to have. A knife saws through rope. A girl swims for the rock. The only place safe from that sound is underneath the water.

Original passage written for Garden Heights — not a quotation from the novel.

1Claim: “In Chapters 11–13, the deadliest dangers work by offering the characters something they want.” — choose the two details that best prove it.Claim & Evidence

2Danger you can see coming, or Danger that arrives as a gift? Tap each detail to send it left or right.Sort into two

◄ Danger you can see comingDanger that arrives as a gift ►

3Match each cause to its result. For each cause, pick its result.Cause & Effect

Clarisse pushes the boilers past their safe pressure→

Percy drinks what C.C. hands him→

Annabeth uses the multivitamins Hermes gave them→

Annabeth cuts through the ropes holding her to the mast→

4Fill both blanks to complete the reasoning.Build the Argument

Riordan gives the Sirens a song that shows Annabeth her deepest wish, instead of one that simply stuns her, because , which shows that .

Part 5

Standardized Test

Reading passage · How Sound Travels in Water · Central Ideas & Words in Context · SAT & TOEFL-style practice

🎯 What this section practices

You already have these skills from the sections above — here they appear in the exact question types the SAT and TOEFL use. Read the passage (the highlighted words are tested below), then answer. Tap an answer to select it, then tap it again to confirm — you can change your choice until you confirm.

SATCentral Ideas — the main point of the passage as a whole
TOEFLFactual Information ×4 — a fact stated directly in the passage
SATWords in Context ×2 — what a word means the way this passage uses it
TOEFLVocabulary — the meaning of a tested word as this passage uses it
SATInference ×2 — a conclusion the passage supports without ever stating it outright

Sound is not a thing that flies. It is a squeeze that travels: a throat or a speaker pushes on whatever surrounds it, that push shoves the next layer of particles, and the disturbance moves outward while the particles themselves stay where they started. How fast the squeeze moves depends on the medium it passes through: the more tightly packed the particles, the sooner each one hands the shove along. In air, sound covers about 340 meters a second. In seawater, where the particles sit far closer together, it covers roughly 1,500.

Water does more than speed sound up; it also lets sound survive. A shout in air fades within a few hundred meters, because the energy spreads and disperses into heat. Low sound in the ocean can travel for hundreds of kilometers instead. About a kilometer down lies a layer where temperature and pressure slow sound to its minimum speed, and it behaves like a pipe: waves straying out bend back toward its center. Fin whales and blue whales sing low enough to use it, which is why two animals on opposite sides of an ocean basin may still be inside one conversation.

The same physics hands some animals a way to see without any light. A dolphin makes rapid clicks, aims them with a fatty organ in its forehead, and listens for what returns. The interval between a click and its echo reports how far away an object sits, and the shape of the echo hints at what the object is made of. Ships borrowed the trick and called it sonar. Because sound outperforms light so completely down there, hearing rather than sight is the long-distance sense of the sea, and anything wanting to be found in the dark will do it with a sound.

Original passage written for Garden Heights — not a quotation from the novel.

1What is the main idea of the passage?SAT · Central Ideas

2According to the passage, how fast does sound travel in seawater?TOEFL · Factual Information

3In the passage, medium means ___.SAT · Words in Context

4According to the passage, what happens to a shout in air after a few hundred meters?TOEFL · Factual Information

5In the passage, disperses means ___.TOEFL · Vocabulary

6According to the passage, what does the layer about a kilometer down do to sound waves?TOEFL · Factual Information

7In the passage, interval means ___.SAT · Words in Context

8According to the passage, what does a dolphin aim its clicks with?TOEFL · Factual Information

9The passage suggests that an ocean animal wanting to be found will ___.SAT · Inference

10Which detail from Chapters 11–13 does this passage BEST explain?SAT · Inference

Part 6 · Optional

Creative Writing

A bonus challenge to practice your English. Take your time and have fun with it.

About This Section

This writing task is optional and is not part of your auto-graded score. The feedback below checks only the basics — length, spelling, and grammar — not whether your ideas are right or wrong. It is meant for classroom discussion and creative practice, so feel free to use your imagination!

Writing Task — Part 5 “The Voice That Knows What You Want”

The Sirens never threaten Annabeth. They show her the life she most wants — her parents together, a friend turned good again, a city built to her own designs — and that is exactly why the wax and the ropes have to be aimed at the listener instead of the singer. Write about something you want badly enough that it could talk you into a bad decision. What is it, what would it promise you, and what would you use for wax and rope? 6–10 sentences. End with the one thing you would refuse to trade for it.

You can start with: “If something could sing me exactly what I want, it would sound like...”

0 / 40 words minimum

🗣 Teach It · Just for Fun (optional)

No right or wrong — close the screen and tell someone nearby what happened in this part. Can’t find anyone? Tell yourself out loud. The moment you teach it, you truly understand it.

Part 5 Complete!

You finished Chapters 11–13 of The Sea of Monsters.

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Your Writing

Your writing was checked automatically for length, spelling, grammar, and whether you included the key parts of the scene. Scroll back to Part 5 anytime to read your feedback and improve your work.

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Independent study guide by Garden Heights. Not affiliated with or endorsed by Rick Riordan. Contains original analysis only; no text from the novel is reproduced. Reference text: This workbook follows Rick Riordan’s classic text (the standard Puffin edition sold worldwide). Revised 2023 UK editions change some wording and may not match the vocabulary studied here.