In Santa Fe, Darrel Two Moons and Steve Katz are working the 4pm-2am Special Investigation shift when they're called to the scene of a blunt-force homicide. The victim is a wealthy art dealer with a shady reputation. Dorothy Breton and her partner McCain are called to downtown Boston on the same night that Dorothy finds a revolver in her teenage son's backpack. Now her elder son is a witness to a killing in a shoot-out. But the autopsy reveals a stunning twist on the cause of death, and Dorothy has to dig a lot deeper to find the shocking truth.