Scotland Yard are hoping to speak to a woman that they believe could hold the key to discovering what happened to Madeleine McCann a decade ago, sources have said.
Detectives are understood to have scoured Europe looking for the woman who was spotted near the family's holiday apartment in the Portugese resort of Praia da Luz on May 3, 2007, when Madeleine disappeared.
Sources have claimed that they are ready to "move in" and interview the woman in a "hugely significant line of inquiry".
It comes on the tenth anniversary of Madeleine's disappearance.