When an off-duty police officer in San Francisco happens upon a minor theft at a lumberyard one Sunday afternoon, he unwittingly jumpstarts an investigation into one of California's deadliest, most depraved serial killers: Leonard Lake and Charles Ng.

In the fall of 1994, an elementary school principal is found tied to a tree outside Oklahoma City, launching a nationwide manhunt for Franklin Delano Floyd, and exposing a staggering, decades-long reign of terror and abuse.

In El Dorado County, CA, firefighters combatting a raging fire discover a burnt out SUV with the charred remains of a beloved local man reported missing just hours earlier, igniting an investigation into a sinister scheme, and exposing a deadly affair.

After a wild Christmas party, Ed Amos wakes to find his wife Bobbe dead from an apparent cocaine overdose. When her toxicology report suggests foul play, detectives dig into their pasts to uncover greed, secret love affairs, and suspicious deaths.

A park ranger in Texas pulls over a suspicious truck filled with marijuana. The passenger flees deep into the desert, unleashing a manhunt that will unearth something far more sinister--and bizarre--than detectives could ever have imagined.

Air Force veteran Michael Giles, disappears from the quiet suburb of Garland, TX. Investigators work through the jigsaw puzzle of a case, discovering mistaken identity, fraud and murder.

When a detective follows up on a series of home invasions as a courtesy to a friend, his investigation brings him face-to-face with a sociopath who is guilty of far more than breaking and entering.

A gun store robbery in Maryland piques the interest of the ATF, igniting an investigation into violence, arson and murder. As detectives zero in on the suspect, they find themselves face to face with an unlikely killer.

In 2012, a missing persons case in North Dakota grabs the attention of Homeland Security. Investigators unravel a scheme involving stolen hydraulic fracturing profits as well as a ruthless con man and his murderous partner.

When a jilted lover storms into a provincial police station making wild accusations against her ex. One detective questions the credibility and motives of the wronged woman.

After a college student goes missing while on spring break, authorities work around the clock to find him. Then, the investigation takes a grisly turn into the world of drug smuggling, the occult, and human sacrifice.

In Oakland, CA, detectives investigate after a boat distributor reports a possible yacht theft, and the resulting sting operation ensnares a master manipulator who has an unexpected day job and a voracious appetite for money and murder.

After pulling over a reckless driver, a police officer unlocks the key to a series of murders. Investigators from various jurisdictions work in tandem to track a sadistic killer with a penchant for torture, robbery and bloodlust.

A man's disappearance in Virginia comes to the attention of authorities and ignites a multi-jurisdictional investigation. A routine inquiry into the missing man's finances reveals a heartless killer with a chequered past.

An Iowa mother gets hailed a hero when she shoots an intruder in her home, but as the case evolves, investigators learn a very different truth. Detectives face off against a master manipulator hell-bent on revenge at any cost.

After three synagogues simultaneously go up in flames, federal agents work around the clock to solve the arsons. They get an unexpected break when a double murder 150 miles away reveals new evidence - and a sinister plot of bigotry, fire and fury.

While looking into a string of home invasions, a detective comes face to face with a sociopath who is guilty of far more than breaking and entering. Then, a bold prison escape catapults the killer to fame and ignites a media frenzy.