Special documentary Madeleine McCann: 10 Years On airs tonight on BBC One.
The one-off Panorama special focuses on Madeleine, who is arguably the world's most famous missing person.
Her disappearance ten years ago on a holiday abroad 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?
Madeleine McCann: 10 Years On sees reporter Richard Bilton, who has covered the story for the BBC since the first days in 2007, examine the evidence and tracks down the men British police have questioned about the case.
Speaking to the BBC News website this week a decade after Madeleine went missing, Kate McCann said: "There is still hope that we can find Madeleine.
Madeleine's father Gerry McCann said: "It's devastating and we really threw ourselves into trying to do everything we could to help find her. It looks like that hasn't worked yet. But you know we are still looking forward... we still hope."
Discussing the police work that's gone into searching for Madeleine over the past ten years, Gerry continued: "Since the Metropolitan Police actually started their investigation, it has taken a huge pressure off us, individually and as a family.
"The key thing was - and I suppose the injustice of it - was that after the initial Portuguese investigation closed, essentially, no-one else was actually doing anything pro-actively to try and find Madeleine.
"And I think every parent could understand that what you want - and what we have aspired to - is to have all the reasonable lines of enquiry followed to a logical conclusion."
Madeleine McCann: 10 Years On airs at 9PM tonight on BBC One.