Somebody knows what happened to Madeleine McCann, the 3-year-old little girl who disappeared without a trace from her bed in a holiday resort on a family vacation in Praia Da Luz, Portugal, on May 3rd, 2007.

Madeleine was sleeping in a back bedroom of an unlocked apartment with her young twin siblings as her parents, Kate and Gerry, ate dinner and drank at a Tapas bar about 75 metres (just over 246 feet) away with friends who had joined them on holiday.

The group of friends claims that they took turns checking on the sleeping children at regular intervals.

Just after 9:00, Gerry took his turn checking on his children. At 10:00, when Kate went to take her turn at checking, she noticed the door to the kids' bedroom was now open, and so was the screenless window.

Kate noticed Madeleine's bed was empty. She frantically searched the apartment to no avail, Madeleine was gone!

Madeleine became the ninth official missing child in the country and one of the most high-profile missing person cases in modern history. And Madeleine McCann soon came to be known simply as, "Maddie".

After all of these years, with thousands of pages printed in newspapers around the world, we just know a very small part of the story.

A huge amount of the facts is still untold and it is probably the only part which holds the key to solve the mystery of...

"What really happened to Maddie?"