It takes a strong woman to keep the peace in a city of endless night. . . . Deep beneath Underground, a cunning bid for power and revenge has begun — one that threatens to make Atlanta the new battleground in the ultimate confrontation between good and evil. The powers of hellish Charbydon have the upper hand after plunging the city into primordial night. And under the cover of darkness, a serial killer targets the most powerful Elysians in the city, the angelic Adonai. For Detective Charlie Madigan and her siren partner Hank, tracking deadly predators is all in a day's work . . . but this case will test the limits of their strength and friendship as it draws them into a deadly world of power plays, ancient myths, explosive secrets, and a race against time that risks all that Charlie holds dear

To save her sister, she must stop a silent killer. . . . Protecting Atlanta from the off-world criminals of Underground is tough enough, but now Detective Charlie Madigan and her siren partner, Hank, learn that the addicts of the offworld drug ash have begun taking their own lives. Ash makes humans the perfect vessels for possession, and something or someone is leading them to their deaths. Charlie is desperate to save her addicted sister, Bryn, from a similar fate. As New Year's Eve approaches and time runs out, Charlie makes a deadly bargain with an ancient race of beings and embarks on a dangerous journey into hellish Charbydon with Hank and the Revenant Rex to save Bryn and make it back before it's too late. Only, for one of them, coming home means facing a fate worse than death

After filling out mountains of paperwork, Detective Charlie Madigan sets out for a death-defying trip into heavenly Elysia to rescue her partner Hank and bring the siren home. Of course, she doesn't expect to leave behind an all out siren revolution or return home to find that jinn crime boss, Grigori Tennin, has begun a massive search 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 awakens Ahkneri from her long sleep. And when Vengeance rises, Atlanta will never be the same