August 1974. Richard Evans was found dead in a city park of Mons, Belgium. In his hands: a Polaroid, showing a strange hippie girl… and then, in a secret compartment in his house, his grandson discovered a series of photographs, each one containing an image of the girl in the Polaroid, dated from August 1914 to 1964. It appears that during the Great War, Richard Evans worked as an agent for the British secret service and probably was involved in experiments with "black propaganda", which eventually would lead to some of the greatest myths of the Great War - the Hell Hound and the Angels of Mons, made famous by author Arthur Machen...