Sleeping Redemption (Feathers of Darkness Duet #1)) by Sadie Winchester:
 
ong before God crafted man from dust, He created a choir of angels to fill the heavens. But a life behind the Pearly Gates was the last thing some of us wanted.

Falling from grace and following Lucifer into the pits of Hell came at a cost, one that has me on a quick descent into madness.

As my past comes back to rip away the fragile pieces of my sanity, can an unhinged trickster demon, my inept guardian angel, and one seriously grumpy archangel keep me safe? And more importantly, will they be able to redeem my blackened heart?

This book is intended for mature audiences 18+ years old. Please refer to the author's website for all content warnings.