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As a slayer of the damned, Kacey Alexander thought she'd seen it all. She's battled vampires, demons, and things that lurk in the darkest corners of the world, but her latest fight against the ancient vampire Akemi has left her more vulnerable than ever. Then, the unimaginable happens. A ship made of fingernails sails into port, and the sky turns blood red. The whispers of an old prophecy become a terrifying Ragnarok has arrived.

Kacey is suddenly thrust into the heart of the Norse apocalypse, a cataclysm of gods, monsters, and cosmic chaos. But as the portents of doom begin to come true, an old enemy rises from the frozen wastes. Mab, the vengeful Queen of Ice and Snow, is back to finish the personal war she started against Kacey.

With cosmic dangers bearing down on her city and an immortal queen of winter determined to see her dead, Kacey must find a way to survive the end of the world and save everyone she holds dear. Can she stop two apocalypses at once, or will this be her final battle?