Oxford: When a woman is brutally attacked while walking her dog in 1995, a local man evades justice once - but not twice, thanks to the double jeopardy law change.
Southampton: The story of Pennie Davis, whose feud with her ex-partner's son leads him to take extreme measures that she paid for with her life.
Dartford: Happy Valley actress Katherine Kelly examines the shocking murder of schoolgirl Claire Tiltman in Dartford, Kent, and the impact it had on the people living there. (S1, ep 2)
Watford: Happy Valley actress Katherine Kelly examines the tragic case of Anne Cook, who was stabbed to death by Leon Amos while she was out walking her dog in Watford. (S1, ep 7)
Hull: Hosted by Happy Valley actress Katherine Kelly, this true crime series travels across the country to examine crimes that rocked a particular city. First stop: Hull. (S1, ep 1)
Barnsley: Katherine Kelly examines the murder of a 69-year-old man in Barnsley. With no signs of forced entry or obvious motive, police are at a loss until CCTV reveals a shock. (S1, ep 4)
Sunderland: Katherine Kelly examines the awful crimes of Steven Grieveson. Known as the Sunderland Strangler he murdered four teenage boys in the early 90s. (S1, ep 9)
A businessman leaves it all behind to travel the world. But his family fear the worst when he falls out of contact. Can investigators solve the mystery of his whereabouts?
Marian Caliman: A violent husband brutally kills his wife, filming her last moments on a mobile phone with their infant daughter in the house.
Doctor Harold Shipman was convicted of killing 15 patients in 2000, but he is thought to have killed up to 215. Discover how he was eventually caught by detectives.
On 19 August 1987, Michael Ryan went on a bloody rampage in the village of Hungerford. Ryan shot and killed 16 people and his crime would change the face of Britain forever.
The harrowing story of EastEnders actress Gemma McCluskie, who was murdered by her older brother in the flat they shared in East London in 2012.
Two Russian friends escape the harsh Siberian winter to go on a vacation in Thailand. But their dream soon turns into a nightmare.
The disappearance of a young German backpacker from a small town in the Australian Outback isn't an isolated instance. Could a serial killer be preying on tourists?
When a couple camping on a secluded Hawaiian beach are attacked by an unknown assailant, police have little to work with as they begin the hunt for a killer.
A talented American artist's romantic Mexican vacation comes to a tragic end when she's the victim of a brutal murder - and the hunt is on for a killer.
A look at the horrific crimes of Angus Sinclair, who murdered two teenage girls in Edinburgh in October 1977.
Taking a closer look at the most horrific crimes ever committed on British soil, starting with the May 2017 Manchester Arena bombing.
Drug dealer Dale Cregan hits the headlines in 2012 when he murders police officers Nicola Hughes and Fiona Bone. Dermot Murnaghan examines the tragic case.
Victims and police discuss the string of historic indecent assaults committed by beloved entertainer Rolf Harris who, in 2014, is sentenced to prison time over a number of sexual offences.