When card dealer Earl Haney is found in an alley badly beaten up his last words to the Marshal about the attack was a man with a mustache and red shirt. With only that limited information Matt already has a suspect in mind my the name of Jim Bostick. Seems that Jim (Mike Connors) has been a problem since arriving in Dodge and even had a feud with Haney plus the fact he wears a red shirt and sports a mustache makes him the prime suspect.
Matt goes over to talk with Jim that has been playing cards all evening and into the morning. The only time he does not have an alibi at the card table is for about an hour around 4am, which just so happens to be the time Haney was last seen. But Jim tells Matt that he went to see Doc Adams about a stomach illness. Matt does not believe the story since Doc Adams is out of town on a medical run. Matt locks up Jim pending Doc's return.
Before Doc arrives back, Jim has broken out of jail and is in route to Coldwater. Matt and Chester ride after him ready to haul him back to the jail at any cost to stand trail for Earl Haney's killing.
A very unusual story that shows that even Marshal Dillon is human and can experience times of weakness. A very entertaining show that makes for great watch for the viewers.
Note- Even though Kitty has no part of the plot, the riding outfit that she had on at the beginning of the episode makes her look as sexy as ever.