The Deadened by D.E. Chapman

The du Sang brothers have finally gotten their mate back, but she’s not the same omega she was before. She’s broken, scarred, and mute.
Now the hunt is on for her kidnapper, but without any significant leads, it’s dead end after dead end. Surprisingly, it’s their father who hands them to key to their mother’s ruin, kickstarting the next phase in their plan.
It just so happens that their mate’s abductor isn’t thrilled about this plan of theirs, and makes it clear they need to stop before their omega pays with her life. Most alphas would call a ceasefire to protect their mates.
But no one ever said the du Sangs were sane.