Piper Madden used to be an Ace Harpy Hunter, but after the death of her brother, she'll do anything to leave that life behind. She flees to the fringe underground zone called the Rift to live out her exile on her own terms.

But the authoritarian Elder Corporation isn't about to let one of their best assets slip through the cracks. Piper is drawn back into the fray on a contract basis to combat a rising Harpy insurgence. As she struggles through her grief, she's caught between her old life in Central and her new, confusing existence in the Rift.

With the president of Elder Corp asking Piper to spy on his sister, navigating the surprisingly passive strategies of the Rift, and a strange friendship with the mysterious Asher, Piper's days are filled with more questions than answers.

Then, a chance encounter leaves Piper privy to a dangerous resistance plot, and as she and Asher team up in an effort to unravel the truth, the secrets they uncover beneath the ancient walls of the dead city will spark their world into a grand-scale war.