Two masters of the thriller genre break new ground with their first collaboration, introducing two different sets of cops in two different cities, faced with two very different murders. 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: a wealthy art dealer with a shady reputation, very few friends and an awful lot of enemies who're not sorry to see him dead. Did he stumble on a burglar stealing a priceless painting, or did someone whose life he'd ruined finally seek revenge? Dorothy Breton and her partner McCain are called to downtown Boston the same night Dorothy found a revolver in her teenage son's backpack. Now her elder son is a witness to the killing of a promising athlete in a shoot-out. At least the evidence is stacked against the obvious culprit – until the autopsy shows the young man didn't die of gunshot wounds, and Dorothy has to dig a lot deeper to find the shocking truth.