Two police officers are escorting an icy mob bosses' widow by train from Chicago to L.A. to testify in a racketeering trial. When they arrive to pick her up, one of the men is gunned down. Now it is up to one man to guard the uncooperative and unappreciative witness on the locomotive while dealing with assassins, bribes, a mysterious woman riding the train with her son, and other possible threats. The Narrow Margin is a fabulous motion picture and is often cited as one of the best B-pictures of all time. Directed by Richard Fleischer and starring Charles McGraw, it is an exciting motion picture that ratchets up the tension with great plotting and wonderful direction. There's not a slack moment or false note in this fine noirish movie.