Mild-mannered Cain comes to town with his guitar and beguiles the Long Branch with a riveting rendition of "Beautiful Dreamer". He's so inoffensive looking, why does he want to kill slick gunman Adams. Adams doesn't know why and wants to avoid a showdown, but Cain seems determined. Maybe it has something to do with Cain's bad heart and having only a short time to live. Meanwhile, Matt is flummoxed.
Dragnet favorite Harry Bartell as Cain delivers a first-rate performance that carries much of the show. We root for him since he seems so basically nice. There's some suspense in why he wants to kill Adams and how that will turn out. Frankly, I didn't find the pacing too slow, though the entry is mostly about character rather than fast draw. Nevertheless, the ending is both ironic and fitting, from the pen of head-writer John Meston.
(In passing—speaking of Meston, note how he sneaks in a reference to a riverboat worker named "Sam Clemens". Though it's left unsaid, that's the real name of Mark Twain!)