Martin Freeman and Imelda Staunton are leading the cast for ITV's new drama A Confession.
The six parter, by the Bafta winning writer Jeff Pope tells the true story of a detective who breached police rules to solve the case of two missing women from Swindon.
The story takes audiences back to 2011 - when Detective Superintendent Steve Fulcher got a confession from the killer of Sian O'Callaghan and Becky Godden
without cautioning him first, or giving him access to a solicitor. It almost led to the collapse of the trial.