'The Disappearance of Madeleine McCann' Documentary Trailer

FILE - This March 2007 file photo released by the McCann family Friday May 4, 2007 shows three-year-old British girl Madeleine McCann. British police say Thursday July 4, 2013 they have launched a full investigation into the disappearance of Madeleine McCann, and want to trace 38 "persons of interest" in the case. Detectives say it's possible that Madeleine, who vanished from a Portuguese holiday resort six years ago, is still alive. (AP Photo/McCann Family, File)

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