Shadows of Sin by Sadie Sears

I’ll do anything to keep her safe. Anything except walk away.
My dragon wants something specific. Someone specific.
Jo.
Chasing after a detective when I’ve lived on the other side of the law is suicidal.
Yet I can’t resist.
If that’s not bad enough, it was my mistake that got her brother killed.
I’ve got demon blood running in my veins.
There’s no saving me.
But she’s my fated mate, and I can’t let her go.
I’m done falling for volatile men.
Besides, there’s no time for a man of any kind while I’m hunting down information about my brother’s death.
Shifters? I know all about them.
But demons? That’s new.
Ash is trouble, and he was hanging around my brother right before everything went to hell.
I know he’s involved.
The more I learn about him, the more questions—and feelings—I have.
I need revenge on the people who killed my brother.
So how can I be falling for the guy caught up in the middle of it?