Wealthy couple Jonathan and Jennifer Hart, a self-made millionaire and his journalist wife, moonlight as amateur detectives.

When a mentor and friend of Jennifer's dies, she and Jonathan return to the sleepy town where Jennifer once lived and worked as a reporter. Nearly immediately, they discover that all is not right within this picturesque town. The town's economic troubles pale next to the danger the Harts find themselves in as they try to sort out whether their friend's death was murder, and what sinister secrets may lie behind the truth.

Set in San Francisco, Jonathan and Jennifer Hart are faced with the prospect of being reunited with Jonathan's long lost sister, and her nephew. Is it possible that Jonathan will finally discover a key to his past or will the "family" turn out to be after something, putting Jonathan and Jennifer in danger's past one more time?

Jonathan Hart, the wealthy entrepreneur, and his charming investigative reporter wife, Jennifer, once again get caught up in a mystery, this time involving corrupt government contractors. Aided by their trusty servant Max, who is more family than employee, and their dog Freeway, the Harts try to resolve issues with an investigation into Jonathan’s business dealings with an old friend in the aerospace industry, and find themselves in the midst of a dark plot which will put Jonathan’s freedom, their home, and even their lives in jeopardy.

In their very last adventure, Jonathan and Jennifer Hart travel to The Big Apple, where a play she wrote in college is being produced on Broadway. But there's sabotage going on, and when a stagehand is murdered, everyone's a suspect - even Jonathan!

The Harts find themselves in the middle of a dangerous murder plot, but it isn't clear if the plot it a famous author's fictional murder-mystery, or an actual murder plot, until Jonathan finds himself the unsuspecting target of a killer. It begins to look like the culprit behind the plot is an old friend, Frank Crane, but there may be a connection to a corporate takeover of Hart Industries as well.