A Confession (2019)

Written by Jeff Pope, A Confession stars Martin Freeman as Detective Superintendent Steve Fulcher, whose search for missing Sian O’Callaghan leads to a major murder investigation and a controversial police decision. Imelda Staunton, Siobhan Finneran and Joe Absolom co-star in this British true-crime miniseries about procedure, grief, justice and the consequences of breaking protocol. The series follows the real case with focus on the victims’ families, the investigation and the legal aftermath.

Från IMDB:
DSU Stephen Fulcher intends on catching a killer of a missing woman, even if that may cost him his career and reputation.