Superintendent James Waghorn investigates the apparently impossible theft from a provincial bank of nearly £10,000 in discarded notes. The bank officials appear to have taken every precaution and neither the official police or the bank investigators can discover the method utilised or the whereabouts of the missing money. Defeated, Waghorn returns to London, but his interest is reawakened eighteen months later when he is recalled to the area to investigate the murder of a man killed on a lonely stretch of road.
