When socialite-turned-detective Irene Lovell finds herself kidnapped by a man she once trusted, she must struggle to free herself. Escape, though, only leads her deeper into the cultic madness and sorcery of the St. Louis underworld. As she works with her friends to stop an unspeakable evil from being awoken, Irene learns that not all of her friends share the same goal. While she seeks to destroy the Drowning Mask, others plan to turn it to their own ends. And others want something even worse: the return of one of the old gods.