“I absolutely believe that in my lifetime we will find out what has happened to Madeleine McCann,” Jim Gamble, the top child protection policeman in the UK’s first Maddie investigation, says.
“There’s huge hope to be had with the advances in technology. Year on year DNA is getting better. Year on year other techniques, including facial recognition, are getting better.
“And as we use that technology to revisit and review that which we captured in the past, there’s every likelihood that something we already know will slip into position.”
It is also claimed that blonde-haired, blue-eyed Maddie is likely to have been kept alive by child traffickers because, as a middle-class British girl, she would be more financially valuable.
“The value that Madeleine had was really high because if they took her it’s because they were going to get a lot of money,” says Julian Peribanez, the private investigator hired by the McCanns.
The documentary also throws light on a haunting new image said to show the three-year-old just days before she went missing.
The picture below shows a small girl dressed in a pink dress and white hat playing at Praia da Luz children's club with other children and an adult.
On the fateful night of May 3 2007 Maddie was left sleeping with her two siblings as Gerry and Kate dined in a restaurant within the Ocean Club resort where they were staying.
Although the series is centred around their daughter's disappearance, Madeleine's parents Kate and Gerry have declined to appear in the upcoming series as they believe it could be detrimental to the ongoing investigation.