Hunted By the Guardian by Kathy Lyons

He was tortured into a monster. She’ll risk everything to bring him home.

Alan Carman survived the cage, the needles, the transformation that turned him into something wrong. Now he’s hunting the villainess who destroyed him—and he doesn’t care who gets caught in the crossfire.
Deputy Tonya Kappes has chased criminals across Michigan, but tracking Alan is different. He’s not just her childhood friend or the brilliant lawyer who kept their clan running. He’s her mate, even if he doesn’t know it yet. And he’s spiraling into a darkness that could cost him everything.
Two more children go missing. Saving them means Alan must master the beast he despises—or lose himself completely. Tonya will do whatever it takes to pull him back: Taser him, chain him, even open her heart to him.

The most dangerous battle isn’t against their enemies—it’s the war raging inside Alan’s soul.