The Battle of the Labyrinth

The Battle of the Labyrinth is a 2008 fantasy-adventure novel based on Greek mythology; it is the fourth novel in the Percy Jackson & the Olympians series by Rick Riordan. Fictional demigod Percy Jackson, who is fifteen years old by the end of the book, tries to stop Luke Castellan and his army from invading Camp Half-Blood through Daedalus's labyrinth by trying to find Daedalus and convince him not to give Luke Ariadne's string, which would help Luke through the Labyrinth