Ghostly doings are afoot in Edwardian London. Choking fog rolls over the treacle- black Thames. Braziers cast eerie shadows in grimy alleyways. Two sinister doctors hunch beside a dying fire in the appropriately-named Printer’s Devil Court, ‘a dark house, with steep, narrow stairs’. Having supped on a hearty repast of lamb stew and treacle pudding, the ‘shadowy’ Dr Walter reveals his dastardly scheme.