What the Killer Did Next - Season 1

Renowned children's author Helen Bailey was reported missing by her fiancé Ian Stewart after she had not been seen for four days. The police strongly suspected Ian, but were unable to progress with the investigation without a body.

Mother of four Saima Khan was stabbed to death in the hallway as she returned home late at night. Police arrive to the house in Luton and are met by her distraught younger sister Sabah who discovered the bloodied body of her older sister.

The manhunt spanned three countries when Geoff Seggie was murdered in his Derbyshire home. His killer eventually made contact, but he never revealed his motive.

Philip Glenister explores the aftermath of Bei Carter's murder in Bridlington. The investigation hinged on the public's sightings after her killer vanished.

Alarm bells ring for detectives when the hunt for Peter Fasoli's murderer leads them to a second body in Italy. Suddenly, the search is on for a serial killer.

Police thought Manchester mum Sian Roberts's murder was a cut-and-dried case when they got a frantic 999 call from her ex. However, they could not have been more wrong.

Police are at a loss when a 79-year-old is killed in her Hartlepool home. But when the evidence mounts and the killer's movements are tracked, the net closes in.

A look into the 2007 murder of farmer's wife Kate Prout in Gloucestershire. Having failed to find her body, police wondered if the truth would ever be revealed.