The second book in National Book Award finalist Katherine Marsh's Myth of Monsters series finds Ava and her friends up against their least-expected foe yet.

Ava Baldwin is ready for her second year at the Accademia del Forte. Now that she knows that her fellow classmates, descendants of the so-called Greek monsters, have been lied to by the Olympians, she's ready to help them uncover their ancestors' true stories—if only she can stay out of the way of the new headmaster, Perseus.

But laying low is easier said than done, especially when Perseus seems intent on trolling Ava, making it impossible to control her anger.

When Perseus banishes one of her friends, Ava must lead a rescue party on a whirlwind adventure from the Stygian Marsh of the underworld to the ice caves of Mount Etna with Ares and the spirits of violent death in hot pursuit. But the gods won't be tricked so easily this time . . .