Cipher by Larissa Ione

It’s been seven months since Cipher, an Unfallen angel who straddled a razor thin line between good and evil, woke up in hell with a new set of wings, a wicked pair of fangs, and a handler who’s as beautiful as she is dangerous. As a laid-back cyber-specialist who once assisted guardian angels, he’d been in a prime position to earn back his halo. But now, as a True Fallen forced to use his talents for malevolence, he must fight not only his captors and his sexy handler, but the growing corruption inside him…before the friends searching for him become his enemies and he becomes his own worst nightmare.
Lyre is a fallen angel with a heart full of hate. When she’s assigned to ensure that Cipher carries out their boss’s orders, she sees an opportunity to take revenge on those who wronged her. All she has to do is appeal to Cipher’s burgeoning dark side. But the devastatingly handsome fellow True Fallen has other ideas — sexy ideas that threaten to derail all Lyre’s plans and put them in the path of an approaching hell storm.
Danger and desire explode, even as Cipher and Lyre unravel a sinister plot that will fracture the underworld and send shockwaves into Heaven itself…