Angel in Training by C.L. Coffey
Release Date: February 17th 2015
Summary from Goodreads:
After a night out turns fatal, a misunderstanding with the Archangel Michael presents Angel with a chance at Eternal Life: the opportunity to earn her wings and one day become an archangel herself.
Angel is given the task of protecting her charge, trainee detective, Joshua Walsh. There's no denying the attraction between Angel and Joshua, only Michael has pretty strict rules: no drinking, no drugs, and certainly no relationships with humans. Thankfully, she's got other things to deal with, like trying to convince Joshua New Orleans has a serial killer who is preying on other angel potentials like herself.
Angel must quickly learn that when keeping someone safe, doing the right thing is not always the easiest, especially when you've got an archangel looking over your shoulder.