This gripping one-off documentary focuses on the investigation into the disappearance of 31-year-old Natalie Hemming in May 2016.

What starts out as one of Thames Valley Police’s biggest ever missing-persons investigations quickly becomes a murder inquiry, with Natalie’s partner Paul the prime suspect.

Despite all the evidence mounting against him, the police need to find Natalie’s body to be sure of securing a conviction.

The programme-makers have gained remarkable access to all aspects of the painstaking investigation, and also to Natalie’s family, who agreed to be filmed.