The battalion suffered heavy losses in action at Gallipoli on 12 August 1915 and a myth grew up later that the unit had advanced into a mist and simply disappeared. The film dramatises these events and the origins of the myth back home, in the process following an investigator sent after the war on behalf of the Royal Family to find the truth about the company's fate. As represented in the film, after becoming separated from other British troops and suffering heavy losses the remnants of the former Sandringham Company were taken prisoner by Ottoman soldiers and then massacred. One survivor wakes in a German military hospital and is told by a doctor that he was fortunate to have been found by German troops accompanying the Turkish forces.