In an idyllic place - a mother disappears from the family home…the front door was left open. She was meant to be collecting her child from school but she didn't turn up. The police were called to the home later that evening, Nat Fraser her husband had been staying elsewhere at the time of her disappearance. A missing person investigation began, but the evidence didn't stack up and detectives began to fear she had been abducted and murdered.

A look at how police tracked down Stephen Port, the east Londoner responsible for murdering at least four men and for committing multiple rapes.