And now comes the time for the great adventure of the Labyrinth... Percy is forced from the very first day to leave his new school, as he faces the terrifying Empousai... He takes refuge at Camp Half-Blood, which is increasingly threatened by the forces of Kronos' army. There he also encounters an enigmatic figure, Quintus, who temporarily replaces the god Dionysus...

But the key to protecting the Camp and the world of the Olympian gods lies underground, in the Labyrinth, which was constructed by Daedalus beneath the palace of Minos, the king of Crete. Percy and his companions must beat Luke, Kronos' representative, to find Daedalus first and obtain Ariadne's thread...

In the dark world of the Labyrinth, every tunnel, every turn, every gate hides a surprise, deadly dangers, and unexpected encounters. All lead to a breathtaking outcome, a prelude to the final confrontation between the world of the Olympians and the forces of the Titans, which will follow in the fifth book, the Last Olympian.