Three sisters. One destiny. Nothing to lose.

Greer has always known she was privileged, though she had no idea how rare her second sight was, even among her triplet monster-fighting sisters. But when a god starts messing with her mind, can Greer step up in her pretty high heels to prevent anything derailing their mission?

Grace loves her adopted brother, Thane, but now that he's back and part of her sisters' team, it's clear his past is full of dark and dangerous secrets. She wants to trust him, but every clue raises more questions. Will his secrets put them?and their fight to save the world?at risk?

Gretchen knows she can count on her sisters to help her stop the monsters. But after bonding with some beasties in the abyss, she realizes her role as a huntress carries a far heavier burden than she ever imagined. How can she be sure what her birthright demands of her now?

As monsters and gods descend on San Francisco in battle-ready droves, the sisters must unravel ancient riddles, locate the lost door between realms, and claim their immortal legacy before it's too late.