In Detroit, Sgt. Ernest Wilson and his team investigate the double-homicide of two twenty-six-year-olds, shot execution-style in the basement. When investigators find a slip of paper at the crime scene, it initiates a manhunt that sends investigators to the other side of the country. And in Harris County, TX, a 79-year-old woman is shot and killed while unloading groceries from her car. As the case unravels, investigators get a startling glimpse of the killer--a teenager with a long history of violence.