Normally, it takes years to work your way up to the twenty-seventh floor. But it only takes thirty seconds to be out on the street again. You dig? Ambitious insurance clerk C. C. “Bud” Baxter (Jack Lemmon) permits his bosses to use his NYC apartment to conduct extramarital affairs in hope of gaining a promotion. He pursues a relationship with the office building’s elevator operator Fran Kubelik (Shirley MacLaine) unaware that she is having an affair with one of the apartment’s users, the head of personnel, Sheldrake (Fred MacMurray) who lies to her that he’s leaving his wife. Bud comes home after the office Christmas party to find Fran has taken an overdose following a disappointing assignation with Sheldrake … Billy Wilder and I.A.L. Diamond were fresh off the success of Some Like It Hot when they came up with this gem: a sympathetic romantic comedy-drama that plays like sly satire – and vice versa. Reuniting one of that film’s stars (and a nasty jab at Marilyn Monroe using lookalike Joyce Jameson) with his Double Indemnity star (MacMurray, cast as a heel, for once) and adding MacLaine to the mix, they created one of the great American classics with performances of a lifetime. Bud can keep on keeping on as a slavering nebbish destined to be the ultimate slimy organisation man or become a mensch but he can’t do it alone, not now he’s in love. This is a sharp, adult, stunningly assured portrait of the battle of the sexes, cruelty, compromise and deception intact. With the glistening monochrome cinematography of Joseph LaShelle memorializing that paean to midcentury modernism, the architecture of the late Fifties office (designed by Alexandre Trauner), and an all-time great closing line (how apposite for a Wilder film), this is prime cut movie. The best Christmas movie of all time? Probably, if you can take that holiday celebration on a knife edge of suicidal sadness and bleakly realistic optimism. Rarely has a home’s shape taken on such meaning.