Elysia may be a heavenly off-world destination, but beyond it, in the siren city of Fiallan, the Circe have punished Charlie Madigan's partner, Hank, into a torturous state between life and death. With all the proper legal channels cleared, Charlie heads to Elysia, not knowing what she'll find, or if she'll ever see the siren again... while at home, jinn crime boss Grigori Tennin has begun an all-out hunt for the divine being Ahkneri. Tennin's tactics set off a chain reaction that puts Charlie in the crosshairs of the shadowy creature known as Death, and stirs Ahkneri from her long sleep, and if Vengeance awakes, Atlanta will never be the same.