Jim ‘Jimbo’ Preston (Anthony Quayle) is an ordinary married man working in the offices of a London timber yard. Jim is in a rut, living a conventional 9-to-5 existence with his absent-minded wife of 20-years in their unkempt tower-block flat, but unbeknown to his wife Amy (Yvonne Mitchell) he is having an affair with the Georgie (Sylvia Syms), the young and confident secretary from work.