Jack Caldwell was born and raised a polite Southern gentleman, but he carries a dark secret. By day, he is a tough MMA fighter. By night, he transforms into Master Jack, a Dom known for his quick temper. Sweet Penny Worthington has been training at the gym with Jack for a while, but is curious when she sees him sneaking into a BDSM dungeon. Hiding secrets of her own, she knows she wants to be dominated by Master Jack. He is afraid to hurt her, but how could he deny her?