Young Wayne plays the son of widower Malcolm Atterbury who wants his son to tend to farming. Jeffreys hears him singing and she and the piano player offer to give him some singing lessons. Singing in a saloon is not a place he favors.
The Cartwrights take him in and they even let him use Adam's guitar. In fact we learn that Adam is making the grand tour of Europe.
How does it all get resolved? Let's say that a venue is found for Newton's singing that Atterbury can't object to.
The series regulars are in a backseat to the singing of both Anne Jeffreys and Wayne Newton.