The two former British police detectives investigating Madeleine McCann's disappearance speak for the first time in this Cutting Edge film.
It follows the detectives as they attempt to piece together what happened two years ago in the Algarve resort of Praia da Luz from eyewitness reports.
Dave Edgar, a retired Detective Inspector who leads the search team, says: 'There's someone local, lives locally, has the answer to this, and not much wider than 10 or 15 kilometres away from Praia de Luz.'
The other full-time member of the search team, Arthur Cowley, who spent three decades as a Detective Sergeant, agrees: 'The answer still lies in Praia de Luz, and it's important that we focus on Praia de Luz and the surrounding area.'
When the Portuguese police shelved the case last summer, they released 30,000 case files. One key statement appears to corroborate the sighting by the McCann's friend Jane Tanner who told police about a man she saw carrying a small girl near the apartment on 3 May at around 9.10pm.
Shortly afterwards on the same night, another family had also seen a man carrying a small blonde child nearby. Their descriptions of the man and of the child were very similar to Jane Tanner's.
And the search team have found a number of statements from tourists, all noticing a suspicious-looking man hanging around near the McCann's apartment.
Statements from the files seem to suggest that the McCanns may have been watched in the days before Madeleine was abducted.
Now the investigators hope that the documentary and reconstruction may jog the memories of others who may know, or have seen, something significant.

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