After someone executes a charismatic New Hampshire businessman in his sleep, the case goes ice cold; detective Robert Freitas uses his wits and a wiretap to outsmart a deceitful associate who believed he'd long since gotten away with murder.

In rural Minnesota, a masked murderer bludgeons an entire family in their sleep; as small-town secrets unravel, Sheriff Mike Gormley uncovers a dangerous love triangle and a vengeful killer who is willing to risk his own blood for retribution.

A mother's charred body leads detectives to a wolf in sheep's clothing.

A double murder leads police to a KKK rally and a confession from "Hell."

After someone abducts a vivacious Ohio undergrad in broad daylight, local police join forces with the FBI. The discovery of blood-soaked evidence kicks the case into high gear and brings investigators face-to-face with the depths of human depravity.

Jacksonville deputies locate the bones of a missing woman. As Det. Mechelle Soehlig pieces together the victim's final steps, a trail of clues lead her from the site of a late-night house party to a mysterious Icelandic biker known as "Viking."

After multiple homicides occur along Virginia's Colonial Parkway, Authorities task Det. Danny Plott with finding a serial killer. When investigators uncover a pattern at the crime scenes about the killer's method, it becomes the key to solving the case.