In Cleveland, when a young mother of three is gunned down in front her home, a neighborhood is paralyzed with fear by a suspect who has a reputation for killing at the slightest provocation. Det. Lem Griffin launches a cross-country hunt to track down this callous suspect before he kills again. And in Broward County, FL, when a young man is shot at birthday party, Det. John Berrena tries to unravel the mystery of why a celebration turned deadly.