Betrayed by her boyfriend and her own sister, MMA trainer Sienna Lane's world is shattered. Consumed by heartache and anger, she vows to make them pay the only way she knows how—by beating him where it hurts most: in the ring.

To take down Jax, she needs the best, and that means partnering with his fiercest rival, the brooding and mysterious Kayden Williams. As they train side by side, punches aren't the only things flying. The chemistry between them is undeniable, but falling for Kayden was never part of the plan.

With revenge in her heart and passion on the line, Sienna must choose: hold onto the fury that drives her, or risk it all for a chance at something deeper. Will her obsession with vengeance destroy her chance at new love?