Sins of the Angels (Grigori Legacy Series #1)

A hard-as-nails cop

Homicide detective Alexandra Jarvis is up against a serial killer unlike any she's ever encountered. She has neither time nor patience for the arrogant new partner assigned to her in the middle of the case, but he seems hellbent on getting in her way--and under her skin--at every turn.

An undercover hunter

A millennium ago, Aramael sentenced his own brother to eternal exile. Now the fallen angel is back and wreaking murderous havoc in the mortal realm, and it's up to Aramae...