The Sea of Monsters

In The Sea of Monsters by Rick Riordan, Half-Blood Percy Jackson has had a fairly quiet 7th grade year.  No monster attacks, until the last day of school, when a group of cannibal giants fight a death match of dodgeball.  When Percy arrives at camp Half-Blood, he not onlyfinds his friend Grover missing like in his dreams, but someone poisoned a pine tree that is a vital part of the camp's magical borders.  Percy must travel to the sea of monsters to save Grover, camp Half-Blood, and possibly the fate of Olympus...

-Mattalex