On 17th February 2014, 19-year-old Lewis Daynes calls the police to say he has stabbed 14-year-old Breck Bednar. Was this the culmination of a plan to take advantage of the younger teen?

Truck driver Collin Reeves calls the police and makes a sickening confession: he has stabbed both of his neighbours to death with a commando knife. But was is pre-meditated murder?

Glastonbury yoga teacher Dawn Lewis calls 999 and says that she has stabbed her lodger Glenn Richards in self-defence. Richards had a history of violence, so Lewis' story seems believable.

When a family refuse to accept their son Jack died of an overdose, they undertake their own investigation, and identify a man with Jack the night that he died. Dots are joined, connecting four murders.

When 33-year-old mother of five Sarah Wellgreen vanished from her home, her ex-partner Ben Lacomba reported her missing. But almost immediately, detectives sensed that something was not right.

The case of Raoul Moat, who attacked his ex-girlfriend, killed her new partner, and shot a police officer, before going on the run and leading Britain's law enforcement on a week-long manhunt. Through interviews with detectives, journalists and those caught in the middle of the chaos, this edition unravels the police work that brought the pursuit to its tragic end

In 2012 the murders of PC Nicola Hughes and PC Fiona Bone shocked the UK. This programme traces the police operation that brought fugitive and convicted killer Dale Cregan into custody.

In 2004, a crime of staggering brutality shattered a quiet community when Joan and Milroy Clarke were found stabbed dozens of times. And the horror only deepened when suspicion fell on their 20-year-old son.

Emma-Jayne Magson reports her boyfriend James Knight is unwell, but when paramedics rush to the scene, he's found dead from internal bleeding. And later, as officers investigate, her story starts to unravel.

When 55-year-old Muriel McKay disappeared from her Wimbledon home in December 1969, her family were thrown into a nightmare that would change their lives forever.

When 34-year-old Debbie Griggs went missing from her family home in Deal, her husband Andrew insisted she had simply walked out, leaving her young children behind. But police sensed something was deeply wrong.

When a retired accountant tells police she's stabbed her husband, she seems unrepentant. Did she snap under a weight of abuse?