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A government intelligence officer vanishes; strange noises from the attic disturb a couple; a murder suspect disappears before he can be charged with the crime. Also: sleepwalkers.

Kenya Monge and Lydia Tillman didn't know each other but they would be forever related, both falling prey to a smooth-talking stranger with a terrifying secret.

Nikki Whitehead was a single mom working toward a brighter future. She found love, moved into a nice neighborhood, and enrolled in college. Then, tragedy struck. Police searched for answers but one thing was certain. This crime was personal.

Newsmagazine that delivers viewers stories ranging from mysteries to documentaries.

Young nursing student Michelle Le had disappeared. Something drew her out to her car, right before cameras caught the car peeling away. Next, there was a series of strange texts. It is discussed whether Michelle was missing or murdered.

An inmate who has served almost 20 years faces the prospect of release.

In 1984, the bruised and bloodied body of 25-year-old Naval recruit Pamela Cahanes is found in a lot.

San Diego 1969. 23-year-old Mary Scott is visited by a friend when she fails to show up for work.

Las Vegas, Nevada, June 1 1989. Stephanie Isaacson sets off on her morning walk to school; she never makes it.

The regrets of inmates are detailed via Scared Straight-type programs for teenagers and messages from prisoners recorded on personal video cameras.

Inmates' actions and their consequences.

A mother of two died after a minor fender bender, leaving loved ones confused and seeking answers.

A young woman was found almost dead in the middle of the road. There was little evidence to go on, so investigators needed to find out what happened from the victim herself, but the problem was that she could not remember.

Wealthy residents felt safe in their gated community, but it was not safe for one millionaire murdered in his waterfront home. Police investigated but the case grew cold. Turned out the key to solving it, or two keys, were right at the front door.

Included: a teenage amnesiac; evidence linked to the yeti; a marine's death.

Psychic David Morehouse; a casino owner's death. Also: a pilot vanishes during a flight; grisly remains are discovered by a homeowner while digging a swimming pool.

Boxer Sonny Liston's death; alleged UFO sightings over Belgium. Also: a car theft leads to murder.

A hostage scheme backfires; a wife vanishes during a vacation in Nevada; car accidents allegedly turn two people into psychics.

A California amnesiac. Also: a young camper vanishes in Canada; a stone etched with cryptic symbols is discovered.

Newsmagazine that delivers viewers stories ranging from mysteries to documentaries.

A wealthy doctor's wife was found dead on Valentine's Day. She had enemies, but he was a suspect regardless.

The murder of an art student from a small Texas town is investigated.

Investigators attempt to get to the bottom of a murder in an affluent, once-peaceful neighborhood.

The regrets of inmates are detailed via Scared Straight-type programs for teenagers and messages from prisoners recorded on personal video cameras.

Pensacola, Florida, New Year's Day 1985. The body of Tonya McKinley is found lying on the side of a city street.

Colorado Springs, Colorado, St. Patrick's Day 1987. The naked body of Darlene Krashoc is discovered by two patrol officers at 5.20am behind a restaurant.

A 17-year old girl arrives home in McCleary Washington and honks her car-horn. Her dad finds her distraught with duct tape around her mouth and her feet zip tied together.

How inmates treat first-timers and sex offenders.

Wedding preparations commence for a female inmate who's about to marry an alleged gang member, and an inmate is forced to choose between his crime family and his blood relatives in the series premiere of this look at life inside Suffolk County Correctional Facility in Riverhead, N.Y.

A husband is shot dead in his own bed. No one else in the house was hurt, not even his wife, who was sleeping beside him. Investigators were suspicious, but there were more surprises in store.

Steven B. Williams, a DJ with a golden voice, vanishes. The clue is wrapped in a napkin, tucked in a cabinet, hidden in a library.

A spotlight on a missing wife who was having an affair with a married guy.

A prolific bank robber is arrested; an embezzler vanishes; a stroke victim becomes an amnesiac. Also featured: the search for two teensagers who disappeared from a pyrotechnics display.

A wayward parolee harasses the FBI; a woman vanishes from a cruise ship; an alleged spontaneous human combustion; a psychic claims he can communicate with a dead sheriff.

An armoured-car robbery and a school bombing are featured. Also: A human skull is discovered beside a Mexican restaurant; a drug dealer is arrested.

A simian creature in Florida is examined; a man is arrested after murdering his whole family; evidence of reincarnation is explored; a suspected drug dealer becomes a fugitive.

A purported UFO sighting in Mexico City is explored; a suspect is charged with child molestation; two cases of abduction are probed; a body is discovered in the Chesapeake Bay.

A brother seeks a long-lost sister. Also: the Boston Strangler; two dead teenage runaways; speculations on the development of military aircraft.

Did Jennifer Corbin's desire to spend one last Christmas with her family lead to her murder?

After arguing with her new husband, Lisa Solomon leaves her home and vanishes into the cold night.

Could a killer's resentment of his family enjoying Thanksgiving together have lead to their murder?

Avis Banks is found dead in her garage. Police suspect that her fiance may not be all that he seems.

Toronto police are on the hunt for a serial killer who likes to dress up as Santa.