Locked, from the inside. That can only mean one thing. And I don’t know what it is. Five famous literary private eyes, including Sam Diamond (Peter Falk), Sidney Wang (Peter Sellers), Jessica Marbles (Elsa Lanchester), Milo Perrier (James Coco) and Dick and Dora Charleston (David Niven and Maggie Smith) are invited to the mysterious millionaire Lionel Twain’s (Truman Capote) castle for a dinner party despite none of them actually knowing him. There, they are told that Twain plans an unsolvable murder in the house at midnight and he will pay $1 million to the one who determines the killer. But when Twain’s blind butler, Bensonmum (Alec Guinness), dies long before the deadline, the stakes go up for the trapped sleuths and it takes a real detective to figure it out … The country house/locked room whodunnit gets a decent parody and a slew of stars indulge in high jinks and costumed fun. You may notice that certain names were altered for copyright reasons (Sam Spade, Charlie Chan, Miss Marple, Hercules Poirot, Nick and Nora et al) but otherwise the ‘satire’ from the pen of Neil Simon translates as smoothly to the screen as a whiskey down the gullet even with the famously incomprehensible ending and a one-off performance by Capote. There’s a built-in discourse on the tropes and flaws of the genre. An absurdist fun item that is now deserving of cult status with a ton of one-liners. Directed by Robert Moore.