The Sea of Monsters (eAudio Book) or eBook by Rick Riordan
After a summer spent trying to prevent a catastrophic war among the
Greek gods, Percy Jackson finds his seventh-grade school year
unnervingly quiet. His biggest problem is dealing with his new friend,
Tyson—a six-foot-three, mentally challenged homeless kid who follows
Percy everywhere, making it hard for Percy to have any 'normal' friends.
But things don't stay quiet for long. Percy soon discovers there is
trouble at Camp Half-Blood: the magical borders which protect Half-Blood
Hill have been poisoned by a mysterious enemy, and the only safe haven
for demigods is on the verge of being overrun by mythological monsters.
To save the camp, Percy and his friends—Grover, Annabeth, and Tyson—must
retrieve the Golden Fleece from the from the Island of the Cyclopes by
the end of the summer or Camp Half-Blood will be destroyed. But first,
Percy will learn a stunning new secret about his family—one that makes
him question whether being claimed as Poseidon's son is an honor or
simply a cruel joke.