I rate this book 5/5 because this series is good. In this book, Percy found out he have a brother that a Cyclops name Tyson, a kid in school Percy protect. At school Tyson always get bully and one day they're in gym class playing dodge ball. Later Percy found out that the people they're playing with are monster and try to kill them. Later on, they went to save his friend Grover, who was held captive and is getting force to marry a monster. Later on they were sent to go on a quest again and was capture by Luke who was trying to revive Kronos. They manage to escape and are saved by Clarisse, who has a boat of her own that was given to her by her father Ares. It is destroyed upon entering the Sea of Monsters. Later on they reach the island of Polyphemus and save Grover with the help of Tyson and Clarisse, recovering the Fleece in the process. Later on Percy have to duel Luke and almost got kill but got save from Chiron and his family member. Fleece cures Thalia's tree of its poison and also brings Thalia back to life.