The Battle of the Labyrinth by Rick Riordan (Book 4 of the Percy Jackson & the Olympians series)

Percy returns to Camp Half-Blood and discovers that an enemy army may invade through the ancient Labyrinth. With Annabeth leading the quest, Percy and his friends must navigate the maze's deadly twists, find Daedalus and stop Luke's forces before they reach the heart of the camp.

• Publisher: Puffin
• Language: English
• Paperback: 384 pages
• ISBN-13: 9780141346830