The fourth book in the Percy Jackson series:
"Honestly, blowing up another school was the last thing I wanted to do."
Percy Jackson is no stranger to near-death experiences, but this one might just take the cake. His arch-enemy Luke Castellan plans to invade Camp Half-Blood via a labyrinth, bringing with him an army of terrifying monsters. Percy and his friends must enter the labyrinth to stop Luke before it's too late...
Rick Riordan - Percy Jackson and the Battle of the Labyrinth
Very Good Condition