Jonathan Hart, a self-made millionaire and CEO of Hart Industries (Robert Wagner) is happily married to the beautiful Jennifer Hart (Stephanie Powers), a freelance journalist. They live in a huge estate with their loving butler, Max (Lionel Stander) and have a Lowchen dog named Freeway who is like a child to Jonathan and Jennifer. One can tell that the Harts - from being millionaires to going around the world - are not your average couple, but another interesting thing about them is that they seem to find murder or any kind of trouble wherever they go whether it's on vacation or because they're trying to help bail out a friend. According to Max, murder is their hobby. However, as busy as they are, they still find lots of time for love and snuggles in between and keep their marriage full of love.