Dr. Arthur Calgary visits the Argyle family to return an address book lost some time ago by Jack Argyle, only to find out that Jack has been executed for the murder of his mother. Calgary can prove that Jack was innocent. In spite of opposition from a hostile family, he is determined to solve the crime.
| Actor | Role |
|---|---|
 Donald SutherlandDr. Arthur Calgary | Dr. Arthur Calgary |
 Christopher PlummerLeo Argyle | Leo Argyle |
 Sarah MilesMary Durant | Mary Durant |
 Annette CrosbieKirsten Lindstrom | Kirsten Lindstrom |
 Faye DunawayRachel Argyle | Rachel Argyle |
 Ian McShanePhilip Durant | Philip Durant |
 Diana QuickGwenda Vaughan | Gwenda Vaughan |
 Michael ElphickInspector Huish | Inspector Huish |
 George InnesArchie Leach | Archie Leach |
| VValerie WhittingtonHester Argyle | Hester Argyle |
 Phoebe NichollsTina Argyle | Tina Argyle |
 Michael MaloneyMicky Argyle | Micky Argyle |
 Cassie StuartMaureen Clegg | Maureen Clegg |
 Anita CareyMartha Jessup | Martha Jessup |
 Ron PemberFerryman | Ferryman |
 Brian GloverExecutioner | Executioner |
| BBilly McCollJack Argyle | Jack Argyle |
| RRobert McBainHotel Manager | Hotel Manager |