In 2009, art detective Dr Bendor Grosvenor caused a national scandal by proving that the Scottish National Portrait Gallery&#39s iconic portrait of Bonnie Prince Charlie, the rebel Stuart who almost seized power in 1745, was not in fact him. Keen to make amends, and suspecting that a long-lost portrait of the prince by one of Scotland&#39s greatest artists, Allan Ramsay, might still survive, Bendor decides to retrace Charles&#39 journey in the hope of unravelling one of the greatest mysteries in British art.