10 years after her disappearance, Madeleine McCann remains one of the world's most famous missing persons. The case has been investigated by police forces in two different countries, but they came up with contradictory conclusions. So what really happened to Madeleine in the Portuguese resort of Praia da Luz?

In this special, reporter Richard Bilton, who has covered the story for the BBC since the first days, examines the evidence and tracks down the men British police have questioned about the case.