Riddick Adkins is a hunter and tracker as well as a full-blooded shifter. When a call comes in from an old friend to find a family member, Riddick answers and takes the job, a decision he regrets, especially after he meets his hard-headed target face to face. Lilly Davis has been on the run for almost a year, staying a few steps ahead of the men her father worked for, but she doesn't know how much longer she can go on. Riddick finds Lilly, fighting off the men who are after her. She has something of theirs, something they want and are willing to kill for it. Riddick and Lilly need to work together if they wanted to survive, but how can they when his shifter heat comes and his need for relief replaces common sense?