Sherlock Holmes - Terror by Night

When the fabled Star of Rhodesia diamond is stolen on a London to Edinburgh train and the son of its owner is murdered, Sherlock Holmes must discover which of his suspicious fellow passengers is responsible.
Director: Roy William Neill
Writers: Frank Gruber (screenplay),Arthur Conan Doyle (adapted from a story by)
Stars: Basil Rathbone, Nigel Bruce, Alan Mowbray