Percy Jackson and the Sea of Monsters

In Percy Jackson and the Sea of Monsters by Rick Riordan, with 277 pages, Percy has to go on a quest to save his friend, Grover. Percy goes on the quest with a girl named Annabeth and his brother, Tyson, a cyclopes. Percy has to rescue Grover from a cyclopes much bigger and stronger than Tyson. In the end Percy rescues Grover and retrieves the Golden Fleece and saves the Greek camp.