 Sequel series to "The Man in Room 17" ; having resigned from the "Room 17" department Oldenshaw rejoined his former partner Dimmock at the Peel Research Fellowship at All Saints College, Cambridge under orders from the Home Office to investigate the changing nature of crime within a set time period. Joining them in their work were programmer Mrs Hollinsczech and servant Thomas Anthem, while their chief adversary was gangster Alec Spindoe.