Detective Brad continues the painstaking work of building a case against a murderer. But even when he thinks the job is done, there is still more to do: He wants to get closure for the victim’s family. Is that even possible? This is part One of Two.

A serial killer is loose in the early 1980s. His attacks are increasingly brutal and his choice of victim is seemingly random. Then, after he commits his crimes he does something confounding: He calls the police and, while seeming to cry, asks them to stop him. But despite his apparent guilt, he continues to kill, while the police desperately try to track him down.

In a small town, one act of arson can be devastating. Detective Chris gets the call early one morning to investigate the cause of a fire at a family-owned arcade. The case quickly evolves into a burglary investigation and then a manhunt when the men thought responsible hit another business. Their destructive path finally leads to a deadly showdown.

In another stunning case from fan-favorite Sgt. Robert, a mother and child are rushed to the hospital in what appears to be the case of a childbirth gone wrong. But almost immediately, emergency staff begin to question whether the woman was ever pregnant at all. Police are called to investigate and uncover a shocking truth.

Forensic specialist Paul Holes recalls the case of a mass-murdering stockbroker bent on stealing his clients’ money to start a new cult. The plan goes horribly wrong, as does the initial forensic investigation.

There are people in the world who, no matter how many chances they get, behave with cruelty and indifference. In this episode, Detective Dave recounts his frustrations in dealing with just such a man named Jeremy, who seemed unable, or unwilling, to control his habit of abusing people he deemed weaker than himself, despite multiple “second chances.”

Detective Dan talks about a case that has haunted him for years. A young woman is attacked while in the home of a well-to-do couple. She breaks free and scrambles to a neighbor’s house to call for help. Dan is the first officer on scene and his investigation turns up disturbing clues that lead him to believe the victim narrowly escaped a couple with deadly intentions.