In Cincinnati, Detectives Jenny Luke and Terry McGuffey investigate the murder of a 56-year-old man brutally beaten to death in the stairwell of his apartment building. Luke tracks down two teenage suspects and is surprised to learn what triggered the deadly fight. In Dallas, Detective Eddie Ibarra and the homicide unit investigate the murder of a 28-year-old singer found shot in his car in a drug deal gone bad. Detectives discover the victim had a troubled past in Mexico that may have caught up with him.