Martin Durnley is a young man with an infantilizing mother, resentful stepfather and an institutionalized brother with Down's syndrome. To cope, he retreats into an alternate child personality he calls Georgie. After being caught during a theft attempt at a department store, he befriends a female customer who is sympathetic to him, but his friendship soon turns into obsession.
Hayley Mills
as Susan Harper
Hywel Bennett
as Martin (Georgie) Durnley
Billie Whitelaw
as Joan Harper
Frank Finlay
as Henry Durnley
Barry Foster
as Gerry Henderson
Phyllis Calvert
as Enid Durnley
Salmaan Peerzada
as Shashie Kadir
Christian Roberts
as Philip Harvey
Gretchen Franklin
as Clarkie
Timothy West
as Superintendant Dakin
Thorley Walters
as Sir John Forrester
Russell Napier
as Professor Fuller
