On 19th August 2004, French student Amelie Delagrange is found on Twickenham Green with fatal head injuries. Detective Chief Inspector Colin Sutton of the Metropolitan Police is appointed as Senior Investigating Officer, tasked with leading the investigation.

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? DS Griffiths persuades Bellfield's frightened partner Laura Marsh to reveal that he is hiding up in the loft. DS Griffiths searches the loft, and finds Bellfield hiding under some fibreglass roof insulation. Finally they have Bellfield in custody.