Adler by Jessica Gadziala

He decided it was time to retire, settle down, become something nice and tame. Like an arms-dealing biker in some town called Navesink Bank. He could get behind that lifestyle.
He’d anticipated a lot of things. Drinking. Brotherhood. A little action peppered in here and there to keep things from getting too dull.
But there was one thing he hadn’t planned on.
A woman moving in across the hall from him. The way something within him recognized something inside her. A past. Secrets. Darkness. Hidden behind thick walls, impenetrable shields, and a biting sort of confidence.
He damn sure couldn’t have prepared himself for the sudden and uncharacteristic urge to force his way into her life, get her to open up to him, feel comfortable enough to give her all the dark and ugly parts of his past. And – dare he even think it – plan a future with her.

You know… if she would stop disappearing for weeks at a time without a clue as to where she was going…