The episode opens with Miss Kitty, with her hair uncharacteristically braided and down rather than assembled into a concise but glamorous bun, sneaking out into the stable in the middle of the night and riding off. She meets a young boy of about ten at a stagecoach depot in another town. They greet each other enthusiastically and affectionately at the depot, and she rides off with him. Any secrecy about all of this that Kitty wished to preserve is ruined by the fact that Jonas, owner of the general store in Dodge City, is in another stagecoach on its way back to Dodge City, and sees all of this. When he returns he of course spills the beans, and soon Matt Dillon, Doc Adams, and Chester all know what happened. Kitty returns to Dodge City without the boy - she left him at a farm with friends. She is completely mum on the subject.
So what nobody is saying and everybody is thinking is - Could this be Kitty's son from her pre Matt Dillon/Dodge City days? In the 19th century a single woman just couldn't have a child born outside of marriage and raise that child in the clear light of day without both being ostracized, so that would explain Kitty's actions. Is this what is going on? Watch and find out.
This is the great thing about these one hour Gunsmoke episodes - the amount of character development that is allowed in the supporting characters. In this episode we see both the softer and fiercely loyal side of Miss Kitty. We also see some of the affection displayed between Matt and Kitty where he tells her how he feels without really telling her and she reciprocates.
This is a rare but very good showcase for Amanda Blake's acting talents, and I'd highly recommend it.