Honestly, blowing up another school was the last thing I wanted to do. As the son of a Greek god, I´ve had my share of near-death disaster. This summer, I didn´t choose to battle the cheerleading squad, but when two hissing she-devils with fangs are heading straight for you, what´s a half-blood meant to do? That was just the beginning. This is the one where my arch-enemy, Luke, is looking for a way to invade our camp via an ancient labyrinth. If he succeeds, thousands of bloodthirsty monsters will attack. So it´s goodbye sunshine, hello darkness as four of us descend into the terrifying underground and beyond . . .