Cambridge, 1924, in early summertime. Everyone is punting, flirting and dancing the tango but bright young Detective Inspector John Redfyre finds himself mired in multiple murders. One morning, his dog discovers a corpse laid on a tombstone. An army greatcoat suggest the dead man may have been a soldier, though the empty bottle of brandy and a card bearing the words 'An Invitation to Dine' on the victim tie him to one of several unsolved cases linked to and sinister dining club. he gradually unearths the dead man's story and fights to right an ancient wrong.