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?
| Directing | Fielder Cook | Director |
| Directing | Ronald Neame | Director |
| Writing | Hugh Mills | Screenplay |
| Writing | Hugh Mills | Novel |
| Production | Kenneth Harper | Producer |
| Production | Ronald J. Kahn | Producer |
| Sound | Bernard Ebbinghouse | Music |
| Camera | Ted Moore | Director of Photography |
| Editing | Norman Savage | Editor |
| Art | Wilfred Shingleton | Production Design |
| Art | Fred Carter | Art Direction |
| Art | John Jarvis | Set Decoration |
| Costume & Make-Up | Julie Harris | Costume Design |
| Costume & Make-Up | Tony Sforzini | Makeup Artist |
| Sound | Gordon K. McCallum | Sound Mixer |
| Sound | Bert Ross | Sound Designer |
| Sound | Otto Snel | Sound Re-Recording Mixer |
| Directing | Ted Sturgis | Assistant Director |
| Art | Richard Williams | Opening Title Sequence |
| Production | Katherine Haber | Producer's Assistant |