Alfred Hitchcock’s murder mystery about a fussy, jolly old lady who boards a train and disappears on it is directed with such skill and velocity that it has come to represent the quintessence of screen suspense. It provides some of the finest examples of Hitchcock touches—little shocks and perversities of editing and detail. The hero is played by a tall, callow young man making his first major film appearance—Michael Redgrave; the heroine is Margaret Lockwood, and the lady is Dame May Whitty.