Lucy thinks the new neighbors are plotting a murder.
Caroline decides to stay home while Charles takes the girls on a trip, but this rare alone time is aggravated when a minor scratch on her leg flares into a major infection. Caroline is close to death when Charles finally gets home to her, and in the wake of this terrifying event, the family realizes--more than ever--the invaluable role of this beloved wife and mother in their lives.
Mason gets slapped by a beautiful blonde private eye and a short time later finds his client charged with murder.
A couple (Rosemary Forsyth, Guy Stockwell) being blackmailed hires Mannix when it appears the wife, not the extortionist, may go to jail.
A sharecropper enters his colt in a horse race hoping to win enough money to buy his farm from the owner who has bet on Mark McCain's entry.