Frankie Rosenberg is the world's first slayer-witch, but she doesn't have that slay-life balance figured out just yet. She's still reeling from the deadly explosion at the annual slayer retreat-and new evidence that some slayers may have survived. And while she's defeated her first Big Bad, Frankie soon realizes it was just a warm up act-and bigger, badder forces of evil are only just getting started. The Hellmouth has been reawakened, inter-dimensional portals are opening, and an oracle warns of a new foe on its way: the Darkness. Could this be what attacked the slayers? And is it coming for Frankie?