The hunt for 10 year-olds Holly Wells and Jessica Chapman touched the lives of almost every person in Britain.
Holly Wells and Jessica Chapman died in August 2002
In this Real Story special we present the definitive account of a crime that shocked the world.
The programme tells the real story of how Cambridgeshire police brought Ian Huntley and his girlfriend Maxine Carr to justice.
In-depth interviews with the senior detectives involved in the investigation reveal for the first time what was really happening behind the scenes as the tragedy unfolded.
At what point did Ian Huntley become the police's prime suspect and when did the alibi that Maxine Carr had provided for him begin to disintegrate?
As Huntley and Carr's trial ends, this documentary will address some of the key questions that remain unanswered.
Fiona Bruce interviewed senior detectives
Why did Ian Huntley kill Holly and Jessica? Why did Maxine Carr lie to the police?
And how did Huntley, a man with a violent and sexually predatory past, ever end up working with children?
Drawing on testimony from former friends and neighbours, from social services, journalists who met Huntley and Carr and the police, we will tell the real story of those two weeks in August 2002 when two 10 year- old girls vanished, apparently without a trace.
Real Story: BBC One, Wednesday, 17 December, 2003 at 2100 GMT and streamed live on the Real Story website.