Percy Jackson and the Olympians, Book Two the Sea of Monsters - Rick Riordan

In this highly anticipated sequel to The Lightning Thief, Percy Jackson discovers there's trouble at Camp Half-Blood--the magical borders protecting Half-Blood Hill have been poisoned. To save Camp Half-Blood, Percy must retrieve the Golden Fleece from the Island of the Cyclops. Percy Jackson and the Olympians, Book Two: Sea of Monsters, The