This is the second book in the Percy Jackson and the Olympians series. It is the sequel to "The Lightning Theif." This book is another beautifully written book by Rick Riordan. I loved the storyline and Riordan's style of writing. Travelling to the sea, Percy and his friends face a lot of challenges involving strength of mind and body.

The magical girl-who-became-a-pine-tree, Thailia, has been poisoned. The magical boundary that protects Camp Half-Blood is weakening, and deadly monsters attempt to wound the demigod boarder patrols as much as they can.There is only one thing that can cure Thailia's Tree:the wonderfull healing Golden Fleece. Percy and his friend Annabeth desparatly need to go on this quest: the Fleece is located in the Sea of Monsters;only a child of Posiden could possibly suceed. But instead, the Oracle chooses Clarssie, a child of Ares!

Percy quickly reveals another reason to go on the quest for the Fleece: he has been having dreams about his friend Grover the satyr, who went to go look for the god Pan, but got captured by a satyr-loving Cyclops...on an island in the Sea of Monsters. The almost-blind Cyclops thinks Grover is a girl and is going to marry him!

Now Percy, his half-brother Tyson, and Annabeth must sneak away from camp to rescue Grover from a dreadful marriage, and insure the Clarssie doesn't get eaten by man-eating sheep.