Fact-based drama looking at the work of Colin Sutton, who was the Senior Investigating Officer in the hunt for Levi Bellfield, the killer of Marsha McDonnell, Amelie Delagrange and Milly Dowler.

Detective Chief Inspector Colin Sutton and his team are trying to identify the white van they have discovered close to the crime scene at the time of the attack from an extensive trawl of CCTV images - but there are 25,000 possible vans that need to be checked and eliminated.

Detective Chief Inspector Colin Sutton briefs the team in preparation for Bellfield's arrest, but when they raid his home they can't find him. Have they lost him?