Salvation's Sinner (Task Force Ambra #1)
Annabella Stone

Axel Shaw keeps his head down and his mouth shut. He has spent his life working on engines. He couldn't care less about drugs on the streets and all that jazz. He is more concerned about why the hell his new neighbor gets under his skin so freaking much? And why is it so much fun to drive him crazy? He really should not be figuring out how fast he can get the sexy assed ex-Delta Operator in his bed... right?
When Axel goes missing, Castello's realization that he is willing to burn this city to the ground to find his mechanic, makes him question if his Salvation could really be a Sinner?