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.

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

Veteran British Airways pilot Robert Brown's call to the police about a serious domestic incident with his ex-wife, Joanna, is used as the starting point in investigating her murder. This episode explores the discovery that officers made at her cottage, Brown's arrest and a comparison between his confession and the far more sinister truth of what really happened

A coroner records a verdict of accidental death for Susan Nicholson. But her family believe there is more to the story: it isn't the first time her partner Robert Trigg has woken to find his partner has died.