On a rainy November night Lindsay Rimer walked the short route from her home to a local shop to buy breakfast cereal. The 13-year-old's body was discovered weighed down in a nearby canal months later. In her pocket, the exact change from the cornflakes she had bought.
The 30 years since her death have seen a so-far fruitless search for her killer and decades of torment for her family.
Senior detectives are not usually immediately alerted to a missing teenager.
On the day the alarm was raised Tony Whittle was chatting with colleague Graham Sunderland.
The conversation turned to the cases they were working on, with Graham saying the force received a call that morning about a young girl who had not turned up for her daily paper round.
Her parents were frantic because it appeared she had not been home all night.