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New Agatha Christie stamps deliver hidden clues | Books | The Guardian

September 16, 2016

Source: New Agatha Christie stamps deliver hidden clues | Books | The Guardian Photographs: Royal Mail/PA Alison Flood Thu 15 Sep 2016 13.19 BST Little grey cells are set to be exercised up and down the country after the Royal Mail announced it would be releasing a series of Agatha Christie stamps packed with “hidden secrets” […]