Mack has been searching for his adopted sister for years after her kidnapping and thinks he has finally found her. His shifter side on the other hand thinks they have found their mate. Fate throws them together in the midst of an oncoming battle and Mack lets instinct take over and follows his heart. Casey grew up in the foster care system and it wasn't easy. A whirlwind of events after she ages out shows her why. Her repressed shifter side emerges with the help of her soon to be mate and his pack. She does her best to learn who and what she as while under the pressure of being hunted by her biological father and his pack.When the truth comes out the mating instinct takes over and together Mack and Casey change the rules of shifter laws once again.