This curated list celebrates the often overlooked but incredibly engaging subgenre of detective films where grandmothers play pivotal roles in unraveling mysteries. These films not only showcase the wit and wisdom of older women but also offer a fresh perspective on the detective genre, making them a must-watch for fans of both mystery and character-driven storytelling.

The Lady Vanishes (1938)
Description: Although not directly about a grandmother, the film features Miss Froy, an elderly woman who mysteriously disappears on a train, leading to a detective-like investigation by the protagonist, Iris Henderson.
Fact: Alfred Hitchcock directed this film, and it was one of his last British films before moving to Hollywood.
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The Ghost and Mrs. Muir (1947)
Description: Although primarily a romance, the film involves an elderly ghost who shares his life story with Mrs. Muir, including a mysterious past that she helps to resolve.
Fact: The film was adapted into a TV series in the late 1960s.
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The Queen of Spades (1949)
Description: The story revolves around an old countess, known as the "Queen of Spades," who holds the secret to winning at cards. Her mysterious death leads to a supernatural investigation.
Fact: The film is based on a short story by Alexander Pushkin and was adapted into a British film with a gothic twist.
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The Trouble with Harry (1955)
Description: This Alfred Hitchcock comedy involves a small town dealing with the death of a man named Harry, with an elderly woman playing a key role in the unfolding events.
Fact: This was Hitchcock's only attempt at a comedy, showcasing his versatility as a director.
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The Private Life of Sherlock Holmes (1970)
Description: While not about a grandmother, the film features an elderly woman who plays a significant role in one of the cases, providing Holmes with key information.
Fact: This film was directed by Billy Wilder, known for his sharp wit and complex characters.
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The Best Exotic Marigold Hotel (2011)
Description: This film involves a group of British retirees, including a grandmotherly figure, who move to India and become embroiled in a mystery surrounding the hotel's finances and future.
Fact: The film was so popular that it led to a sequel, "The Second Best Exotic Marigold Hotel."
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The Lady in the Van (2015)
Description: This film tells the true story of an eccentric woman who lives in a van parked in a writer's driveway, leading to a series of mysterious and humorous events.
Fact: Maggie Smith, who plays the titular character, was nominated for a Golden Globe for her performance.
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Knives Out (2019)
Description: While not exclusively about a grandmother, the film features a memorable character, Great Nana, who plays a crucial role in the unfolding mystery. Her sharp mind and unexpected insights help unravel the family's secrets.
Fact: The film was inspired by the works of Agatha Christie, and the character of Great Nana was specifically written to add an element of surprise and depth to the narrative.
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Arsenic and Old Lace (1944)
Description: Two elderly sisters, Abby and Martha, are at the heart of this dark comedy where they poison lonely old men out of kindness, leading to a detective-like investigation by their nephew.
Fact: The film was based on a successful Broadway play, and Cary Grant's performance is often highlighted as one of his best.
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The Wrong Box (1966)
Description: This comedy involves a tontine, where the last surviving member inherits a fortune, leading to a series of comedic and mysterious events involving elderly characters.
Fact: The film stars Peter Sellers and features a script by the renowned comedy writing duo, Michael Pertwee and John Cleese.
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