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.

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.

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.

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?

This entry in the long-running romance of Jonathan and Jennifer Hart picks up following the death of their beloved friend Max when the Harts go to Montreal for the reading of his will. While there, they learn of a clock Max has left for them with his niece, Marie, which is stolen before they can receive it. Meanwhile, Marie’s partner in their antique shop, Vivienne, meets with Ronnie, her secret lover and the husband of the Harts’ friend Lady Camilla Ashley, and is subsequently killed. The clock seems to be at the center of a mystery which includes kidnapping and murder, and the Harts will have to unravel it if they want to get their gift from Max back.

One of the final entries in the series of romantic suspense adventures takes Jennifer and Jonathan Hart off to Sydney, Australia, where they plan to purchase a wildlife reserve from Jennifer’s old flame, the handsome and mysterious Elliott Manning.Manning challenges Jonathan, and their old rivalry is rekindled, with Hart besting Manning every time. When Manning begins to behave strangely toward Jennifer, a series of disturbing events reveals that this rivalry is no longer so good-natured, and the Harts find themselves bait in a trap.

On a mission of mercy, Jennifer Hart is in Germany to donate bone marrow to Maximilian, a young leukemia patient. Following the operation, she plans to spend a romantic anniversary in Munich with her husband Jonathan. The bone marrow clinic's director, Peter Donner, is surprised by Jennifer's uncanny resemblance to his French fiancée, Simone Grohe. When she goes missing, Jennifer steps in to play the role of Simone to save Peter the embarrassment of an explanation to his cousin and benefactor Karl von Ostenberg at the lavish engagement party. But, of course, it is Karl who kidnapped Simone - in order to control the fate of Peter's inheritance - and now Jennifer is in as much danger as Simone! Once again the Harts tackle danger and mystery with their usual devil-may-care charm and romance