Kind Hearts and Coronets
Dennis Price, Valerie Hobson, Joan Greenwood, Alec Guinness, Audrey Fildes, Miles Malleson, Clive Morton, John Penrose, Cecil Ramage, Hugh Griffith, John Salew, Eric Messiter, Lyn Evans, Barbara Leake, Peggy Ann Clifford, Anne Valery, Arthur Lowe, Peter Gawthorne, Molly Hamley-Clifford, Leslie Handford, Cavan Malone, Jeremy Spenser, Carol White, Laurence Naismith, Gordon Phillott, Richard Wattis, Harold Young
7.7 from IMDB
When his mother eloped with an Italian opera singer, Louis Mazzini was cut off from her aristocratic family. After the family refuses to let her be buried in the family mausoleum, Louis avenges his mother's death by attempting to murder every family member who stands between himself and the family fortune. But when he finds himself torn between his longtime love and the widow of one of his victims, his plans go awry.