It all starts when Percy's class has a dodgeball game at school. The other team, Percy found out aren't human, they're Laistrygonian monsters. Tyson, Percy's cyclops brother, and Annabeth save Percy and bring him to Camp Half-Blood. When they arrive there were two Colchis bulls attacking camp. They also found out Thalia's tree had been poisoned. Chiron is suspected of poisoning the tree and was fired.
Grover tells Percy in a dream that he's being held prisoner by a Cyclops and that he's in the Sea of Monsters (mortals know it as the Bermuda Triangle.)
Percy and Annabeth ask for a quest to save Grover and also to find the Golden Fleece, the magic that will save Thalia's tree. But Tantalus (Chiron's replacement) chose Clarisse, daughter of Ares to go. So Annabeth, Percy, and Tyson sneak off with Poseidon and Hermes help. This book is action-packed and amazingly detailed and even though it's my second time reading it, it's still fantastic and always will be. So I recommend it (but read The Lightning Thief first.)
-Anna
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