Death's Hand, A Dark Urban Fantasy (The Descent Series, Book 1)

Policing relations between Heaven, Hell, and Earth is messy and violent, but Elise Kavanagh and James Faulkner excelled at it--until coming across a job so brutal that even they couldn't stand to see one more dead body. Now they've been pretending to be normal for five years, leaving their horrific history a dark secret. Elise works in an office. James owns a business. None of their friends realize they used to be one of the world's best killing teams.

After years of hiding, something stirs. Bodies are vanishing. Demons scurry in the shadows of the night. A child has been possessed. Some enemies aren't willing to let the secrets of the past stay dead...