For years, Lt. Joe Kenda investigated hundreds of murder cases, but the ones that haunted him most were the ones left unsolved. Now, Kenda is returning to ID to close the cases that kept him up at night. The unsolved rape, mutilation and murder of young G.I. Darlene Krashoc haunts Joe Kenda years after he turned in his gun and badge, until a cold case investigation uses Kenda's groundwork to set a trap for a monster hiding in plain sight.