After a triple murder and rape following a family wedding, investigators quickly revealed their number one suspect as a man calling himself "The Fox".

In September 2014 two Pennsylvania State Troopers were shot at by a lone sniper in the Poconos Mountains. A manhunt was launched but finding the killer in a vast forest was no easy task.

When detectives were called to a road rage incident on London's busy M25 motorway, they were stunned at what they found.

When a series of unexplained illnesses and deaths darkened the wards of a hospital in Greater Manchester, doctors and detectives were mystified.

When 34-year-old French film producer Laureline Garcia-Bertaux vanished from her home in London, her friends were baffled.

When 17-year-old Shari Smith and nine-year-old Debra May Helmick were abducted and murdered just weeks apart in South Carolina, the local community were shocked.

When 8-year-old Sandra Cantu vanished while playing outside her California home in March 2009, the local community were stunned – her body was discovered ten days later.

When the severed head of 18-year-old Barry Wallace washed up on a remote beach in Scotland, investigators knew a gruesome murder had taken place.

When 18-year-old Samantha Koenig vanished while working at a coffee kiosk in February 2012, investigators in Anchorage, Alaska were left baffled. CCTV footage uncovered the shocking truth.

When 59-year-old Charlie Taylor was found murdered in his North Carolina home, the number one suspect was soon revealed.