Bronn by Callie Rhodes

They made him into a monster.

For years, he was kept underground, his body and mind warped by the cruelest scientists in the beta world. Tested, tortured, and honed into the perfect killing machine, Bronn learned that his survival hinged on the death of others.
Now, he’s out of that prison, but that doesn’t mean he’s free. How can he be when redemption is impossible for someone with so much blood on their hands?
Only she can turn him back into a man.
Gabriella was taught that safety was the path to happiness. But now, her world has been turned upside down, and those who promised to keep her safe are the same ones threatening her life. Just when she thinks she has nowhere left to turn, she finds an unlikely ally…the most dangerous alpha the world has ever seen.
Once there were boundaries…but now that their chains are broken, these alphas refused to be contained.