The Sea of Monsters
Rick Riordan
 The story begins with Percy having a nightmare about Grover being chased by a cyclops. The nightmare ends with a big voice booming, "MINE!" It is the last day of school at Meriweather Prep, and Percy's only friend, Tyson, is being teased by bullies, though there are more of them that day than usual. In gym class, the extra bullies reveal themselves as Laistrygonians (cannibal giants) and attack Percy. Annabeth appears to have been following Percy to talk to him about her own nightmares. She helps Percy and Tyson defeat the Laistrygonians, and the three of them return to camp in the Gray Sisters Taxi. In the taxi, the Gray Sisters tell Percy that "the location [he] seeks" is 30, 31, 75, and 12. Though Percy is confused and asks them what they mean, he is not informed, because they find the camp is under attack by the Colchis Bulls, from which Clarisse and some of her cabinmates are trying to defend. With help from Tyson, Percy and Annabeth manage to defeat the monsters, but Percy finds out that Tyson is a Cyclops. Clarisse tells them that Thalia's tree, which protects the camp, has been poisoned by an unknown intruder and is dying. The magical borders that protect the camp are also failing. She also informs them that Chiron, the activities director, has been fired because he is suspected of poisoning the tree, and is replaced by Tantalus, a prisoner who has been brought from the Fields of Punishment. Poseidon claims Tyson as his son at dinner. Percy has another dream of Grover, and this time Grover and Percy talk to each other (Grover had earlier had made an empathy link, allowing them to communicate sometimes while Percy is sleeping) and Grover reveals that he is trapped in The Sea of Monsters by a Cyclops named Polyphemus. Grover says that "it" is here, but Percy wakes up before he can ask what Grover means. The day after, Percy asks Annabeth if she understands what the dream about Grover means. Annabeth tells him that Grover may have found the Golden Fleece, and they both realize that the Golden Fleece can cure Thalia's poisoned tree. That night at the campfire, Annabeth and Percy ask Tantalus to send somebody on a quest to find the Golden Fleece, which he does, sending Clarisse. Percy gets angry with Tantalus, but doesn't know what to do. Later that night, when everyone else is asleep, Percy sneaks out to the beach and is met by Hermes, who gives him three duffel bags full of money and clothes, a magical thermos that holds the four winds, and a box of Minotaur-shaped multivitamins. He tells him that he must choose to board a passing cruise ship. Annabeth and Tyson arrive, and they decide to go to the cruise ship before security harpies consume them. Percy receives help from Poseidon, who sends them three hippocampi, and together with Annabeth and Tyson, end up on the cruise ship, the Princess Andromeda, which is revealed to be owned by Luke. They are captured and learn that Luke is trying to reform Kronos, the lord of the Titans. They manage to escape on a lifeboat and go to Chesapeake Bay, where Annabeth leads them to a hideout that she had created a few years earlier when running away with Luke and Thalia. Tyson gets a box of donuts which he got from a nearby donut shop (Monster Donut). They are attacked by a Hydra, which is killed by Clarisse who has a boat of her own that was given to her by her father Ares. The boat is an ironclad from the Civil War. They sail for the Sea of Monsters (which has now moved to the Bermuda Triangle) and Clarisse plans to destroy Charybdis and also encounters Scylla, who devours the captain of the ship as well as a few others of the crew. The engine overheats and explodes, and Clarisse's boat is destroyed and eaten by a monster. Percy and Annabeth make it out (Tyson is presumed dead), but lose their duffel bags; plus, the thermos has been emptied because Annabeth opened it "a little too far." They eventually find an island where Circe lives, and dock at her island, which turns out to be a spa. However, Percy is turned into a guinea pig and is put in a cage with six others. Annabeth frees him by using the multivitamins to become resistant to magic, and gives some to Percy and the others, who become human again. It turns out that the other six guinea pigs were Blackbeard (son of Ares) and his crew, and Percy and Annabeth use Blackbeard's ship to get away. As they are sailing, they pass the land of the Sirens. Annabeth, who knows that the Sirens tell of their innermost desires, decides that she wants Percy to tie her to the mast and have her listen to the Sirens' songs. However, Percy forgets to remove her knife, and she manages to free herself, almost reaching the island, but Percy manages to save her; in doing so, he learns that the Sirens' song made Annabeth see what she wanted most: her parents reunited and Luke converted back to the side of the gods, all having a picnic, in front of a brand new Manhattan, rebuilt by Annabeth. He grabs her before she can get out of the water and gets her back under, creating a giant air bubble so that she can breathe, and they make it back to their ship. On board, Annabeth tells Percy that her fatal flaw is hubris (deadly pride). They reach the island of Polyphemus – where they find Tyson safe and alive – and save Grover with the help of Tyson and Clarisse, recovering the Fleece in the process. They make their way to Florida, and Percy sends Clarisse, with the Fleece, back to camp. Percy, Annabeth, Grover and Tyson are captured by Luke, and are taken to the Princess Andromeda. Percy manages to contact camp with an Iris-message, tricking Luke into admitting he poisoned Thalia's tree. In a duel with Luke, Percy is nearly killed. He is saved by Chiron and his relatives, the "Party Ponies". Chiron is rehired after being proven not guilty, and the Fleece cures Thalia's tree of its poison; however, Thalia herself is spewed out of the tree. Chiron realizes that everything that had happened had been to bring back Thalia, just to "put another chess piece into play".