August 1920. A society wedding at Ely Cathedral in Cambridgeshire becomes a crime scene when a guest is shot just as the bride arrives. Two weeks later, after a fruitless search for clues, the local police are forced to call in Scotland Yard. But not before there is another shooting in a village close by. This second murder has a witness; the only problem is that her description of the killer is so horrific it's unbelievable. Badgered by the police,...