Wealthy London banker Gerald Hardcastle, his wife Prudence, his mistress, and his family and servants all get involved in comic hi-jinks when they swap birth-control medicines in an effort to deceive each other.

Prudence Hardcastle (Deborah Kerr) 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 (David Niven), or all of the above?—Mike Smith <[email protected]>