
Prudence Hardcastle is on the pill. So is her sister-in-law, but someone has been swapping aspirin for their pills. Is it the teenage niece, the maid, the chauffeur, a lover, Prudence's husband Gerald, or all of the above?
Cast

Deborah Kerr
Prudence Hardcastle

David Niven
Gerald Hardcastle

Robert Coote
Henry Hardcastle

Irina Demick
Elizabeth Brett

Joyce Redman
Grace Hardcastle

Judy Geeson
Geraldine Hardcastle

Keith Michell
Dr. Alan Huart

Edith Evans
Roberta Bates

David Dundas
Tony Bates

Vickery Turner
Rose
Hugh Armstrong
Ted

Peter Butterworth
Chemist

Moyra Fraser
Woman in Tea Shop

Annette Kerr
Gerald's Secretary

Harry Towb
Racetrack Official

Jonathan Lynn
Chemist's Assistant
Ivor Dean
City Banker in Taxi Cab (uncredited)

Arthur Hewlett
Mr. Ferguson (uncredited)

Michael Hordern
Dr. Morley (uncredited)
John Tatham
Man Sitting in Grandstand at the Races (uncredited)
Joseph Tregonino
Waiter (uncredited)
Crew

Richard Williams
Opening Title Sequence

Fielder Cook
Director

Ronald Neame
Director
Hugh Mills
Screenplay, Novel
Norman Savage
Editor

Ted Moore
Director of Photography
Ted Sturgis
Assistant Director
Ronald J. Kahn
Producer
Kenneth Harper
Producer
Katherine Haber
Producer's Assistant
Wilfred Shingleton
Production Design

Julie Harris
Costume Design
Tony Sforzini
Makeup Artist
Bert Ross
Sound Designer
Otto Snel
Sound Re-Recording Mixer
Gordon K. McCallum
Sound Mixer
Bernard Ebbinghouse
Music
John Jarvis
Set Decoration
Fred Carter
Art Direction
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