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The Tragedy On Tennessee 14. When a Tennessee State Trooper is murdered on a highway, police turn to his dashcam for answers. It takes more surveillance video to find the killer. S8, Ep3

Four murders. One killer. Shocking failings. Experts reveal how easy it was for Stephen Port to deceive, and how and why those lies were believed.

Who Killed Miss Brown Sugar. Erica Vassell disappears after a party in Clewiston, Florida. When her brutally murdered body is found days later, everyone is left in shock and fear. S4, Ep8

Dangerous Takedown. In 1997 two burglars broke into a home and shot at a police officer. One year later clues to the location of the suspects are revealed. S6, Ep14

Teleshopping.

Teleshopping.

Teleshopping.

Teleshopping.

Bridge Rescue and the Aftermath. Officer Sadler discovers what she thinks are fighting cocks in the back of a pickup truck and Lieutenant Scott is faced with a daring bridge rescue. S6, Ep12

Short Fuse. The occurrence of letter-bombing is becoming increasingly more frequent, but the crime lab is the place where the scientists pursue the bombers. S1, Ep11

Death Grip. Fingerprints are an indisputable, time-tested method of establishing someone's ID. New computerisation means identification can now take only minutes. S1, Ep12

Officers try numerous methods to enter a fortified building, only to find the building booby trapped and a runaway motorist is insistent that the car he's in isn't stolen. S3, Ep4

Officers are forced to deal with a violent repeat offender in Nottingham and officers make a huge drug bust in a supposed 'family home'. S3, Ep5

Ben Lacomba. When Sarah Wellgreen suddenly disappears, detectives desperately search for her. But after discovering no evidence, they investigate closer to home. S3, Ep10

No Remorse. Explore the mystery behind the body of a drug courier found burning in an alley. The FBI capture a drug lord who uses violence to keep people quiet. S3, Ep17

Hidden Agenda. The FBI is hot on the trail of bank robbers who leave behind bombs after their crime, but there's more to their cause than meets the eye. S4, Ep2

Vanished. When the wife of a wealthy man vanished, an unusual ransom note provided clues to the captor - who turned out to be involved in one of his companies. S4, Ep5

Half A Sandwich. A feud between a man and his stepfather boils over when they fight over the family home. A night of violence finally tears the family apart for good. S1, Ep5

Vengeance In Vegas. In Las Vegas, 2009, two men come face to face over a woman - three years of feuding end in 13 fatal seconds. Decades on, neither family can forgive. S1, Ep4

Body Shop Of Horrors. Two men start an auto body repair business, but a bitter feud erupts, and one man goes missing with indisputable evidence of a brutal murder. S1, Ep6

The Letter. Two sisters grow apart after they marry into different circumstances, a rift that results in cold-blooded murder. Police receive a mysterious letter with the dark truth. S1, Ep6

Murder Has Two Faces. When Diane Hart's husband cuts her off financially, she turns to her sister for support. They devise a deadly plan to get the money they believe she deserves. S2, Ep5

The Torment. Janece Cook moved in with her parents after struggling with her mental health. But, when Janece's behaviour is linked to her dad's suicide, her sister seeks revenge. S2, Ep6

Keith Bettison. On Halloween, police discover the body of Ildiko Bettison in her Chessington home. Detectives follow a trail of missteps to uncover the truth. S5, Ep6

One Hundred Percent A Monster. Trina's childhood becomes a living nightmare when her mother brings home her boyfriend, Robert. He is not only controlling but also a violent killer. S10, Ep17

Experts analyse the former Prime Minister's colourful past and complicated relationship with the truth. Was his career littered with lies?