‘Mystery man’ clue in bid to solve 40-year disappearance of great-grandmother Heather Marks admin 2 hours ago USA Update Comments Off on ‘Mystery man’ clue in bid to solve 40-year disappearance of great-grandmother Heather Marks 3 Views The family of a Sydney woman who vanished decades ago have called for help as a new clue in the mystery of her disappearance is revealed. Share Facebook Twitter Stumbleupon LinkedIn Pinterest