The kidnapper tries to get his ransom money by directing the courier across the Pennines in Northern England in thick fog.

Andy Whittaker and Dr Julia Shaw explore events from the day with former detectives Bob Taylor and John Plimmer along with Stephanie's best friend Stacey Kettner.

There’s graphic descriptions of violence told in a mixture of contemporary interviews and BBC archive. For details of help and support in the UK, visit bbc.co.uk/actionline.

Producer: Andy Whittaker.