When a potential spree killer targets the most vulnerable in Tulsa, Oklahoma. Detective Max Ryden must stop the murderer before he kills again.

In Mobile, Alabama, a man who turned his life around is gunned down in cold blood. Detectives need to know if his troubled past came back to haunt him.

In Tulsa, Oklahoma, a barrage of gunfire kills a man while he's sitting in his car, with his 2-year-old daughter in the back seat. An elderly Atlanta man is burned alive in a building fire suspected to be arson.

When a young man is found executed in the street and a second victim is shot nearby, detectives scramble to track down the dangerous gunman before he kills again.

In Georgia's Gwinnett County, a teenager is gunned down outside a nightclub when he winds up at the center of a gang feud.

In Mobile, Alabama, a 68-year-old woman goes missing after checking into a casino where she had lost millions.

In Atlanta, after his mother reports him missing, a man is found dead, naked and shot twice in his bedroom.

In Atlanta, a woman is found dead in a garbage can, and a young man is ambushed by neighborhood bullies.

When a young man goes missing in Tulsa, Oklahoma, detectives must crack a family's code of silence in order to find him.

In Atlanta, a stranger guns down a new father in a parking lot. In Georgia's Gwinnett County, a man is stabbed more than 20 times when someone he trusts turns against him.

In Mobile, Alabama, the murder of a 19-year-old becomes personal when the team learns that the victim is Detective Jermaine Rogers' cousin. In Tulsa, Oklahoma, a 31-year-old mother is gunned down in front of her home by an unlikely suspect.

In Mobile, Alabama, a street fight escalates to a shooting that leaves a man dead in his front yard. In Tulsa, Oklahoma, a drive-by shooting stemming from a gang feud claims the life of a 16-year-old girl, while her boyfriend clings to life.

In Mobile, Alabama, a young man is murdered at his girlfriend's house when drive-by shooters unload several dozen rounds at the home; in Tulsa, Okla., a Jeep is found crashed along the highway with a man sitting inside, shot dead.

When an innocent bystander protecting a young woman is gunned down, detectives scramble to learn who fired the fatal shots before anyone else gets hurt.

When a father of three is executed on his front porch, Gwinnett County Homicide discovers that those closest to him are hiding a dark secret.

In Mobile, Alabama, a 70-year-old Vietnam vet is found beaten to death in his home, where detectives discover cryptic threatening letters; in Tulsa, Okla., a random shooter reveals startling new information on a cold case.

In Tulsa, Oklahoma, detectives suspect a random roadside encounter when they find an unidentified cyclist gunned down in the middle of an intersection outside the airport.