In Dallas, when a young father is gunned down in front of his house, Detective Steve David discovers that the victim had a secret that may have led to his murder. Then, in Cleveland, a mother is found strangled and burned in her kitchen, but Detectives Nate Sowa and Ray Diaz have no witnesses and little evidence to track down her killer.

In Cleveland, a man is gunned down at home in front of his family just a few days before Christmas. Detectives Tom Armelli and Bob Ford must delve into the dangerous business of drug dealing to hunt down the killers.