As they enter the Sea of Monsters, they have to get past Scylla and Charybdis. Instead of trying to sail in between the two, Clarisse automatically goes for Charybdis and Tyson supposedly dies in Clarisse's ship after it sinks. After that, Percy and Annabeth journey to many dangerous islands, and Annabeth tells Percy many things about how Thalia died and she also mentions her prophecy and tells Percy that he has a choice to make when he becomes 16 years old. Fighting their way through many other obstacles, like the Sirens and Circe's island, they join up with Clarisse, Grover, and later Tyson (who did not die), and leave with the Golden Fleece.