Bolander, Munch, Howard and Felton all meet to serve a routine warrant, but are caught in an ambush when a gunman opens fire, critically wounding three of them. Pembleton is assigned as the primary in the investigation and is partnered with Detective Theresa Walker who specializes in the psychology of their prime suspect, a pedophile. Bolander's ex-partner Mitch Drummond from the bomb squad offers his help on the investigation.