When American millionaire Charles Delacro (Robert Mitchum) stumbles into the private quarters of Victor (Cary Grant) and Hilary (Deborah Kerr), an English aristocratic couple who allow public tours through their stately mansion, he brings a whirlwind of trouble with him. Hilary's dissatisfaction with her staid life plus verbal sparring with Charles about Anglo-American differences spark a romance between the two, easily perceived by Hilary's husband, Victor. When Hilary goes to London to meet Charles secretly, an old flame of Victor's visits to give him advice on his disintegrating marriage and to perhaps seduce him too. Victor's solution' Invite his wife's lover up for the weekend to engage in some fishing and a duel. Woven together with a wide streak of humor is a wonderful, surprisingly rich and blunt scrutiny of marital troubles and endurance.
A surprisingly sensitive yet humorous look at the marital troubles of Victor and Hilary, THE GRASS IS GREENER follows the tale of Hilary's falling in love with an American millionaire who woos her to London while her perceptive husband, Victor, weaves his own plans to convince Hilary to return to him without the fuss that could terminally damage their marriage. The gossip that his wife's lover bought her a fur coat, which Victor had been scrimping for for years, sends him over the edge, leading him to challenge the millionaire to a duel.
The film was based on the play by Hugh and Margaret Williams.
Christian Dior designed Simmons's clothes; Hardy Amies designed Kerr's.