After French student Amelie Delagrange's body is found on Twickenham Green in 2004, Detective Chief Inspector Colin Sutton of the Metropolitan Police is appointed as senior investigating officer, tasked with leading the investigation.

DCI Colin Sutton and his team are trying to identify the white van spotted 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.

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.

Colin is asked to carry out a review of Operation Minstead, an ongoing case described as a “black hole”.

Colin presents his review findings to DCS Hamish Campbell and suggests a strategy called 'Minstead Lite'. But Hamish wants Colin to stay on to see this new approach through.

Will the Force Tasking Group fund Colin's high stakes gamble? Not only is it expensive, but there's absolutely no guarantee it will work.