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The Sea of Monsters · Garden Heights
Part 7
for The Sea of Monsters · Part 7 · Chapters 16–18
8 Parts40 min
What Happens in Part 7
Winning the Fleece is not the same as keeping it. Polyphemus wades into the surf and throws boulders after the escaping ironclad, the engine is driven past what it can take, and Percy orders Annabeth, Grover and Clarisse into the lifeboat while Tyson stays below with the failing boiler. The ship explodes. Percy comes to in open water believing his brother is dead, and hippocampi tow the survivors toward the Florida coast. Ashore in Miami, Percy makes a quiet decision: he hands the Golden Fleece to Clarisse and sends her home by air, because the quest was assigned to her and she should be the one to finish it. Then the surprise arrives — Luke’s people are watching, and Percy, Annabeth and Grover end up prisoners aboard the Princess Andromeda. Cornered, Percy keeps Luke talking until Luke boasts about the crime no one could prove: he poisoned Thalia’s tree himself. At that moment Chiron’s centaur relatives storm the ship with arrows and paintball guns, the three demigods get off alive, and the confession they carry away clears the teacher the camp had blamed.
Reversal, the apparent death of a beloved character, and a villain’s confession
Cross-Curricular
Straits and tides: why narrow water runs fast, and where whirlpools come from
Chapter Summary
Ch.
What happens
16
I Go Down with the Ship — the Fleece is aboard and the island is behind them, but Polyphemus wades out and hurls boulders after the ironclad. The old warship is pushed past what it can stand, and Percy sends Annabeth, Grover and Clarisse away in the lifeboat while Tyson stays below to hold the failing boiler together. The explosion tears the ship apart. Percy wakes in the water certain that his brother is gone, and hippocampi carry the survivors toward the Florida coast.
17
We Get a Surprise on Miami Beach — ashore and grieving, Percy makes the decision that ends the quest properly: he hands the Golden Fleece to Clarisse so the camper it was assigned to can carry it home by air. Percy, Annabeth and Grover head off on their own route, and the surprise waiting for them is not a friendly one. Luke’s crew is watching the marina, and the three of them are taken aboard the Princess Andromeda.
18
The Party Ponies Invade — cornered on the enemy’s deck, Percy keeps Luke talking until Luke boasts about the one thing nobody could prove: he poisoned Thalia’s tree himself. Then Chiron’s centaur relatives storm the ship with arrows and paintball guns, and in the confusion Percy, Annabeth and Grover get off it alive. The confession travels with them, and it clears the teacher who was blamed for the poisoning.
Part 1
Vocabulary
Study 10 key words from Chapters 16–18, then answer each question.
📚Knowledge Bank · Words for Narrow Water
Oceanography · The Language of StraitsSailors keep a precise vocabulary for the places where the sea pinches shut. A strait is a narrow channel joining two larger bodies of water, and because the same volume of water has to squeeze through a smaller opening, it moves faster there than anywhere nearby. The moving water itself is a current; when the rise and fall of the tide is what drives it, the flow is called a tidal stream, and it changes direction several times a day. The short calm between one direction and the next is slack water, and small boats wait for that window on purpose. Where fast water scrapes past a headland or a shallow bank, part of the flow spins off into a rotating patch called an eddy; a large, lasting eddy is what most people call a whirlpool. Charts mark the worst of these places with a word that is a warning rather than a description, and every mariner learns to read that word first: hazard.
abandonv.Ch.16
To leave a place or thing behind, especially in an emergency
“A captain gives the order to abandon a ship only when nothing else will save the crew.”
debrisn.Ch.16
Broken pieces left after something is destroyed
“Burning debris rained into the water for a full minute after the blast.”
periln.Ch.16
Serious and immediate danger
“Every extra minute in the engine room added to the peril.”
grievev.Ch.16
To feel deep sorrow, especially for someone who has died
“Percy has no quiet place to grieve and no time to do it in.”
salvagev.Ch.16–17
To save something valuable from a wreck or a disaster
“They salvage one thing from the explosion, and it is the thing they came for.”
ambushn.Ch.17
A surprise attack made from a hidden position
“A sunny beach is a strange place for an ambush, which is exactly why it works.”
treacherousadj.Ch.17
Dangerous in a hidden way, or willing to betray
“Calm water above a fast current is the most treacherous kind.”
reinforcementsn.Ch.18
Extra fighters who arrive to strengthen a side already in a fight
“Reinforcements arrive on hooves, and nobody on deck expects them.”
vindicatev.Ch.18
To clear someone of blame or suspicion
“One boast is enough to vindicate a teacher who lost his job over a lie.”
retreatv.Ch.18
To pull back from a fight or from a dangerous position
“Fighters who are badly outnumbered retreat and look for better ground.”
ⓘ 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.
1Broken pieces left after something is destroyed are ___.Ch.16
2To clear someone of blame or suspicion is to ___ them.Ch.18
3‘Peril’ means serious and immediate danger.Ch.16
4To save something valuable from a wreck is to ___ it.Ch.16–17
5Fill in each blank with the correct word.Ch.16
Word choices:abandongrievedebrisperil- some words will not be used
The crew is ordered to the burning ship.
Percy has no quiet hour in which to for his brother.
6A surprise attack made from a hidden position is an ___.Ch.17
7‘Treacherous’ describes water that is safe and easy to cross.Ch.17
8‘Reinforcements’ are extra fighters who arrive to help a side already fighting.Ch.18
9Fill in each blank with the correct word.Ch.18
Word choices:vindicateretreattreacheroussalvage- some words will not be used
A boast overheard by witnesses can someone wrongly blamed.
Fighters who are outnumbered toward safer ground.
10To leave a place behind in an emergency is to ___ it.Ch.16
Part 2
Comprehension
Show you understood what happens in Chapters 16–18.
🌊Knowledge Bank · Why Narrow Water Runs Fast
Earth Science · Tides and Tidal StreamsTwice a day most coastlines rise and fall, because the moon’s gravity pulls a bulge of water around a spinning planet. The rise is the flood tide and the fall is the ebb, and between them the sea has to shift enormous quantities of water sideways. In the open ocean that movement is gentle and almost invisible. Squeeze it into a channel a few kilometers wide and the same water has to hurry, the way a river quickens where the banks close in. Two seas joined by a strait rarely reach high water at the same moment, and that difference in phase is what turns a channel into a river with no fixed direction. Water piles up on the higher side and pours toward the lower one until the tide turns and the whole flow reverses. Mariners measure that flow in knots and time their crossings to the hour, because a boat that makes eight knots cannot fight a stream running at six. In narrow water the thing that decides the passage is the clock, not the engine.
1How do Percy and his friends leave Polyphemus’s island with the Fleece?Ch.16
2What does Tyson do while the damaged ship is trying to outrun the boulders?Ch.16
3What does Percy believe about Tyson after the explosion?Ch.16
4Percy flies back to Camp Half-Blood on the airplane with the Fleece.Ch.17
5Write the numbers 1–5 in the boxes to show the correct order of events in Chapters 16–18. Number 1 = what happens first.Ch.16–18
Percy sends the others off in the lifeboat as the boiler fails.
Percy hands the Fleece to Clarisse for the flight to camp.
Centaurs storm the deck of Luke’s cruise ship.
Boulders from the island strike the escaping ship.
Hippocampi carry the survivors toward the Florida coast.
6Luke admits that he was the one who poisoned Thalia’s tree.Ch.18
7Why does Percy give the Golden Fleece to Clarisse in Miami?Ch.17
8Who arrives to rescue Percy, Annabeth and Grover from Luke’s ship?Ch.18
9Percy escapes Luke’s ship without ever getting Luke to talk about the tree.Ch.18
10What does Luke’s boast about the poisoning finally do?Ch.18
Part 3
Literary Elements
Understanding HOW and WHY Rick Riordan tells the story across Chapters 16–18.
🎭Knowledge Bank · The Rescue That Costs Something
Literary Craft · Reversal and EscalationAdventure plots rarely stop at the moment the prize is won. Riordan takes the Fleece off the island early and then spends three chapters asking what holding on to it will cost. The swing from safety toward danger has a name, reversal, and a series of them turns a straight line of events into a story. Here the reversals escalate. First the sea nearly takes everything, then a stretch of ordinary vacation sand hides an ambush, and finally the hero is standing on his enemy’s deck with nothing left to bargain with. Riordan also reaches for the oldest tool in the adventure kit, the apparent death of a beloved character, which asks the reader to feel a loss before the plot has finished with it. Notice what the escalation actually measures. It is not how strong Percy is; it is what he is willing to hand over. Each rung of the ladder costs him something, and the last thing he gives up is his pride.
Reversal
The prize is won and then nearly lost twice — once to the sea, once to an ambush on a sunny beach.
Apparent death
A beloved character is taken out of the story so the reader feels the loss, and the plot keeps that loss working for two full chapters.
Confession scene
A villain who cannot resist explaining himself hands the hero exactly the proof he needs.
1The sudden swing from safety back into danger in these chapters is called a ___.Ch.16–18
2Fill in each blank with the correct literary term.Ch.16–18
Word choices:reversalforeshadowingsettingclimax- some words will not be used
A sudden turn from safety into danger is a .
A hint dropped early about something later is .
3Riordan lets Percy believe Tyson is dead mainly to ___.Ch.16
4Ending Chapter 16 with a loss instead of a celebration raises the stakes for what follows.Ch.16
5Luke’s bragging on the deck is a classic ___ scene.Ch.18
6The rescue by the centaurs is set up earlier in the novel rather than invented on the spot.Ch.18
7Putting the ambush right after the disaster at sea mainly ___.Ch.17
8Fill in each blank with the correct literary term.Ch.18
Word choices:ironysuspensemetaphordialect- some words will not be used
The uncertainty about whether help will arrive in time is .
A boast that ends up helping the hero is an example of .
9These chapters are narrated by Annabeth rather than by Percy.Ch.16–18
10Giving the Fleece to Clarisse makes Percy’s victory feel ___.Ch.17
Part 4
Think Deeper
Four deeper challenges — no single-word recall. Read, weigh the evidence, and reason it out.
🌎Knowledge Bank · The Real Strait of Scylla and Charybdis
Geography · Messina and Its WhirlpoolsGreek storytellers put two of their worst monsters in a channel a modern ferry crosses in about twenty minutes. The Strait of Messina separates Sicily from the toe of Italy and narrows to roughly three kilometers, and it joins two seas whose tides do not rise at the same time. That mismatch drives water through the gap in fast surges that slow, hesitate, and then run the other way roughly every six hours. Where the surge scrapes past shallow ground it throws off spinning patches of water that local fishermen have been naming for generations, and to a small rowed boat those patches were genuinely dangerous. On the mainland shore stands a steep rocky headland and a town still called Scilla. Face that cliff on one side and the churning water on the other and the famous choice between two evils stops being a figure of speech and becomes a route. The monsters were invented; the danger they describe is plain geography.
Think back over these chapters. An old iron ship shuddering under boulders, a lifeboat pulling away from a deck nobody should still be standing on, and then heat and noise and water. Percy surfacing alone, certain that the brother who stayed below is gone. Horses with fish tails towing survivors through warm water toward a coastline of hotels. A sunny beach, a decision made quietly — the Fleece placed in Clarisse’s hands so the quest belongs to the person it was given to — and then an ambush that puts three exhausted demigods on the deck of the wrong ship, where a young man in expensive clothes cannot stop explaining how clever he has been, right up to the moment the hooves hit the stairs.
Original passage written for Garden Heights — not a quotation from the novel.
1Claim: “Across Chapters 16–18, Percy protects the quest by giving things away rather than holding on to them.” — choose the two details that best prove it.Claim & Evidence
2Something a sailor could measure, or Something the story adds? Tap each detail to send it left or right.Sort into two
◄ Something a sailor could measureSomething the story adds ►
3Match each cause to its result. For each cause, pick its result.Cause & Effect
Polyphemus hurls boulders after the escaping ship→
Percy sends the others away in the lifeboat→
Percy hands the Fleece to Clarisse in Miami→
Luke brags about poisoning the tree→
4Fill both blanks to complete the reasoning.Build the Argument
Riordan puts the ambush on Miami Beach immediately after the shipwreck because , which shows that .
Part 5
Standardized Test
Reading passage · Where Two Seas Meet · Straits, Tides & Whirlpools · 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×2 — the main point of the passage as a whole
TOEFLFactual Information×3 — a fact stated directly in the passage
SATWords in Context×2 — what a word means the way this passage uses it
SATInference×2 — a conclusion the passage supports without ever stating it outright
TOEFLVocabulary — the meaning of a tested word as this passage uses it
A strait is a narrow channel of water that joins two larger seas. Because the same amount of water has to pass through a smaller opening, a strait almost always runs faster than the open ocean on either side of it. Most of that motion comes from the tide, the slow rise and fall produced by the pull of the moon. Two seas joined by a strait seldom reach high water at the same minute, so water piles up on one side and pours toward the other until the tide turns and the flow reverses.
Where two currents converge, the water does not simply blend. One stream slides over or under the other, and the boundary between them can boil with standing waves. Fast water passing a headland or a shallow bank throws off a rotating patch called an eddy. A large and lasting eddy is what most people call a whirlpool, and the strongest of them turn faster than a person can swim.
The Strait of Messina, between Sicily and the Italian mainland, is barely three kilometers wide at its narrowest point. The tides of the two seas it joins run hours apart, so the current there can race, stop, and then run the other way. Fishermen still have names for the swirling patches, and crews in small rowed boats had every reason to fear them. Greek storytellers placed two monsters at exactly that spot: a many-headed creature on the cliff and a swallowing mouth in the water. The hazard was real, and the faces were added later.
Original passage written for Garden Heights — not a quotation from the novel.
1What is the passage mainly about?SAT · Central Ideas
2According to the passage, a strait runs faster than the open ocean because ___.TOEFL · Factual Information
3In the passage, strait means ___.SAT · Words in Context
4According to the passage, the flow in a strait reverses because ___.TOEFL · Factual Information
5The passage suggests that a small rowed boat in a fast strait ___.SAT · Inference
6In the passage, converge means ___.TOEFL · Vocabulary
7According to the passage, the Strait of Messina at its narrowest is about ___.TOEFL · Factual Information
8The passage suggests that the monsters in the Greek story ___.SAT · Inference
9In the passage, eddy means ___.SAT · Words in Context
10The passage ends by separating the hazard from the faces mainly to ___.SAT · Central Ideas
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 7 “What You Hand Over”
In these chapters Percy gives away his place in the lifeboat and then gives away the credit for the quest. Write about a time you gave something up — a turn, a position, the last word, the recognition — so that something bigger could work out. What did it cost you, and what did you get that you did not expect? 6–10 sentences. End by naming one thing you would still refuse to give away.
You can start with: “The part I did not want to give up was...”
0 / 40 words minimum
🗣 Teach It · Just for Fun (optional)
No right or wrong — 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 7 Complete!
You finished Chapters 16–18 of The Sea of Monsters.
Here are your auto-graded results:
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points out of 100
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.
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.
