Holiday-maker Mark Terry calls the police after his friend Gary Pocock is found dead on the beach, hideously beaten and unidentifiable except for a distinctive dragon ring he always wore.

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

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?

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...

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?

On 13th March 2011 a distressed 999 call comes in from Julie Dixon, partner of well-loved carpenter David Twigg. Julie is clearly in a state of shock as she tries to describe the attack by masked men and that her partner is locked in a storeroom that has been set on fire.

Although she has suffered burns she manages to escape to raise the alarm. The fire brigade arrive but unfortunately they can't save David. It's very unusual for a murder to happen in the sleepy Lincolnshire village of Burgh Le Marsh.

Friends and family rally ‘round to support Julie who is in a traumatised state. Nobody can understand why anyone would want to murder David. The local community are terrified, and police are under enormous pressure to catch the culprits quickly. Julie helps police with their enquiries and describes the attackers and the events that took place in detail.

As they start their enquiries the police discover that David's business was in serious debt. Could this be a factor in his murder? They start to pursue different leads: did he owe someone money? Was it a robbery gone wrong? Or a neighbour with a grudge?

But their investigation stalls and so they begin to relook at the case again, starting at the beginning with the person who made the 999 call – his partner Julie. This sends the investigation into an unexpected and shocking direction.