Luke D'Wit tricked his millionaire neighbors into thinking he was a harmless IT geek before poisoning them so he could take over their business. His harrowing call to police gave detectives their first clues in bringing the poisoner to justice.

A young mother is feared dead. Seven years later, her ex-partner admits he’s responsible on a call to emergency services. After he retracts his confession, an undercover cop gets to the truth. Also, the heartbreaking death of a 10-month-old baby.

Mitesh Patel strangled his wife in order to claim insurance and start a new life with his lover. After ransacking their home to make it look like a burglary gone wrong, he made a tearful call to emergency services, unknowingly leaving clues as he spoke.

David and Ann-Marie Pomphret seemed a close and loving couple. When Ann-Marie is found battered to death, a distraught David calls police. Forensic scientists detect microscopic blood cells on his unwashed socks and the truth is revealed.

Andrew Pearson kidnapped his ex-partner Natalie Harker before strangling, drowning and sexually assaulting her. In a distraught call to police, he then tried to claim her death was an accident but inadvertently left a series of clues as he spoke.

Flames engulf a village workshop, killing owner David Twigg. Police hunt for two masked intruders, who were reported in a call by David's partner, Julie Dixon. Later, at the trial, the judge says Dixon’s call is worthy of an Oscar nomination.

Ex-Commando and trained killer stabbed his two neighbors to death after a long-running parking dispute. He claimed his actions were due to a mental breakdown caused by his Army service. But his cool and calm call to police told a different story.

It sounds like a routine call to police, but it's a deadly trap. The caller is a killer who’s vowed vengeance on the police. When two unarmed female officers turn up to investigate, they are brutally murdered by one of Britain’s most wanted fugitives.