A nightclub proprietress who sings plays a mysterious role in the Endicotts' sudden streak of good fortune.

Grandpa plays a key role in a battle between the Endicotts' fellow tenants and their anonymous landlord.

Professor Mike Endicott's former college roommate, Bill Marshall, now an entrepreneur of the swinging, international ‘‘Catnip Clubs," persuades financially troubled Mike to moonlight as manager of his newest club, opening in Rome. Craig Stevens guests as Marshall. Mike takes the job temporarily because he's hard-pressed for money to buy all the things his growing daughters need. He is tempted to stay on permanently until the job interferes with his role as father.