Jonathan Hart is a self-made millionaire and the CEO of Hart Industries, a global conglomerate. His wife Jennifer is a beautiful freelance journalist. Living the jetset lifestyle, the glamorous couple spend their free time as amateur detectives. At their opulent California home, they are assisted by Max, their loyal, gravelly-voiced butler, cook, and chauffeur who also helps out in their "cases." The Hart's beloved pet dog is "Freeway".
A friend of millionaire Jonathan Hart appears to have committed suicide whilst returning home from The Golden Goose Health Spa. He is joined undercover by his wife, Jennifer, as they try to find out what really happened.
Jonathan expresses an interest in buying an aircraft company from a friend and finds himself implicated in a murder case when corrupt defense contractors aim to prevent the takeover. Meanwhile, Jennifer has difficulty getting her latest story published and Max experiences problems training Freeway Jr.
When Jennifer's beloved teacher and mentor dies suddenly, she leaves the town she owned, Kingman's Ferry, to Jennifer. A trail of mysterious clues leads the Harts to long-kept secrets about the town that were directly tied to her friend's "accident," and it looks like they're destined to meet the same fate unless they can solve the mystery of Kingman's Ferry before it's too late.
Someone is trying to sabotage a Broadway production of a play Jennifer wrote in college. When one of the stage hands is murdered, even Jonathan is a suspect. The Harts don't have much time to ensure that the show will go on.
Jonathan and Jennifer travel to publisher Alfred Raines' private island for a party at which Raines is hoping to sign Jennifer to a writing contract. When Jennifer overhears someone plotting to murder a man during the weekend, she and Jonathan set out to discover who's trying to kill who and almost get themselves killed in the process.
At a Hart Industries charity auction, Jennifer finds a locket that could hold the key to unlocking Jonathan's early years spent at the Mission Street Orphanage and the family he never knew.
Grief-stricken Jonathan and Jennifer travel to Montreal for the reading of Max's will. A special gift from Max to the Harts holds the key to murder, intrigue, and suicide.
The Harts travel to Australia to purchase a wildlife reserve from Jennifer's former love interest. Believing that Jonathan stole Jennifer from him years before, Elliott Manning plots to frame Jonathan for his murder and take back his beloved Jennifer.
Munich is the setting of yet another Hart Anniversary except this time Jennifer takes on a whole new personality. She's there to save a young boy's life, who knew she'd have to save her own too.