In Tucson, Arizona, the Union Jack team joins the police and FBI to investigate the facts behind the conviction and death sentence of a supposedly innocent young man. Mystifying clues stymie their efforts, and when new murders of children and prostitutes begin to multiply, the hunt heats up. Quint, Deliverance, Wilde, and Victor find themselves in a deadly quagmire of misdirection, secrets, and pure evil. But this time around, their teenage children are drawn into the Union Jack circle. Approaching adulthood with smarts, daring, and determination, two daughters choose vocations that relate to crime investigation, while a son takes a path into the dark recesses of the mind. As a pair of siblings insinuate themselves into the lives of the team, their fates all hinge on the mystery. Can they put an end to the ferocious threat that challenges their future, or will this villain prove to be superior and cause their downfall? The clock ticks as the source of evil becomes clear ... and shocking.