When Minneapolis homicide detectives Leo Magozzi and Gino Rolseth are called to a crime scene in a heavily wooded city park, everything about the setting is all too familiar. And when they discover a playing card on the victim's body, their worst fears are confirmed --- there’s a serial killer operating in the city for the first time in years. Weary of the darker side of their computer work for law enforcement, Grace MacBride and her unconventional partners at Monkeewrench Software agree to take on a private missing-persons case in a small farming community in southwestern Minnesota. As the violence accelerates in Minneapolis, Magozzi and Gino soon realize their killer is planning to complete the deck, and they enlist Monkeewrench to help stop the rampage.