Mnemosyne walks free again, Mirabel Radcliffe is still at large, and Katherine Avery is dead. But Kate isn't out of the picture yet - she's a revenant now, a living soul in a dead body, gifted with her benefactor's magical capacities for the manipulation of mind and memory, cursed with the thirst for human blood. Now Kate must feed on the living so she doesn't lose her mind, and fight her fellow undead to bring down the international conspiracy that cost her her life.