A Mate's Revenge — P. Jameson

Cael is an alpha who has no mate, and he isn't looking for one. His heart forever belongs to his long lost childhood sweetheart. Years ago, her intended mate laid claim, ripping the two of them apart. Cael has never forgiven him for the injustice. Or her, for betraying him. But even with his bitterness riding him like a bad omen, he can't look away while she is brutally mistreated. There's only one thing to do: exact revenge on his enemy, and deal with the woman who betrayed him later.

Isabesh is in trouble. She's played her last hand in her alpha mate's game of control and now her brother might pay the cost. Vesh has been exiled for treason he didn't commit, but he'll be left alive as long as she cooperates. The problem is, cooperating means helping her mate wage a war on the man she gave her heart to as a wolfling, and his Ravendale pack. When word gets back to Ozarka that one of their own is the intended mate of the Ravendale alpha, Besh knows she's running out of time to tell Cael the truth: that sometimes protection can look a whole lot like betrayal.

***Book #3 of the Ozark Mountain Shifter Series. Not meant to be read as a stand-alone.
***Contains explicit language and sex.