Former Army Ranger and security specialist Derek Cooper now lives the peaceful life of a cowboy, running the family cattle ranch in Colorado. He prefers the company of cows and horses to his former military lifestyle. However, a Good Samaritan act helping a stranded motorist brings violence to his door. Her brother has died, and she’s afraid they’re after her, too. Will Derek and his ranch hands—also former Rangers—return to the lives they’ve left behind to help her? When it appears that her brother was on the trail of bioterrorists when he was killed, will they have a choice?