When a young woman turns up dead in south Texas, Captain Federico Calderon fears the killer has disappeared into Mexico; as more bodies turn up, investigators pick up on the trail of a serial killer, leading to a showdown in the streets of Laredo.

In Minnesota, firemen put out a housefire and find a woman's body inside; Agent Rob Fraik learns that the victim was babysitting a friend's daughter, who is now missing; it is a race against time to track down the killer with a horrifying motive.

Police find an accomplished U.S. Forest Service worker executed beneath a mound of snow in Northern California; a missing wallet and a pair of jumper cables send Investigator Greg Hagwood on a multi-state manhunt for the killer.

The body of a South Carolina man turns up floating in the Black River. Investigator Allen Morris, working his first homicide case, must scrutinize the victim's wife and mistress and ultimately untangle the web of deceit surrounding his disappearance.

Amongst the ashes of a barn fire, N.C. investigators discover the remains of two dismembered women; agent Nick Deming must dig into the victims' personal lives to uncover a revenge scheme and a killer.