The true story of Detective Sgt. Stephen Fulcher, his hunt for missing 22-year-old Sian O'Callaghan and how it led to the arrest of Christopher Halliwell.
- Starring: Martin Freeman, Imelda Staunton, Siobhan Finneran, Charlie Cooper, Joe Absolom
- TV Network: ULSTER
- Premiere Date: Sep 2, 2019
- Genre: Crime
- Executive producer: Jeff Pope