- Percy and his friends continue to sail towards safety, but they are forced to change their plans when they encounter a group of monsters riding giant sea turtles.
- A battle ensues, and Percy and his friends manage to defeat the monsters and escape.
- They decide to seek refuge in a nearby forest.
- There, they meet Thalia, a daughter of Zeus who has been turned into a pine tree.
- Thalia tells them about the prophecy and how she was supposed to be one of the three who would save Olympus but that she was tricked and killed.
- She urges them to continue their quest and warns them of the dangers that lie ahead.
- Percy and his friends decide to press on, determined to fulfill the prophecy and save Olympus.