Mrs. Blossom meets charming lawyer Allan Turner at a Maryland airport, and he gives her a gummy to ease her flight anxiety.

Allan tells Mrs. Blossom in London that she has missed her Paris connection and pays for her hotel room that night.

Allan visits Mrs. Blossom's London hotel room for a nightcap, and the two share a passionate kiss.

On the Chunnel train to Paris, Mrs. Blossom notices a man in a plaid suit staring at her intently.

Paris police inform Mrs. Blossom that Allan Turner died falling from a hotel balcony and show her his cryptic farewell text.

Danny takes Mrs. Blossom to a park and reveals he is an FBI agent tracking a stolen Pakistani statue called the Quqnoz.

Mrs. Blossom boards her Seine cruise and angrily confronts Danny, who claims he has joined the ship purely for pleasure.

During a Vétheuil day trip, Mrs. Blossom's purse is nearly stolen in a violent attack, and she demands Danny show real credentials.

Private investigator Tess Monaghan tells Mrs. Blossom that Constance Saylor apparently drowned in Switzerland and the museum arsonist died in a gas explosion.

Passenger Pat Siemen publicly accuses Danny of theft; his locked safe is opened revealing the Quqnoz statue, her diamond ring, and Swiss cash.

Mrs. Blossom deduces that the salmon-colored melatonin gummies Allan gave her are actually the Quqnoz statue's missing sapphire ornaments.

Pat reveals herself to Mrs. Blossom on the stateroom balcony as Constance Saylor, who faked her own death, and demands the sapphires.

Mrs. Blossom throws the gummies and her diamond earrings into the river, then physically knocks Marko off the ship's balcony.

Danny reveals his estranged father was the museum handyman who stole the Quqnoz, and that Marko murdered both him and Allan.

Back in Baltimore, Mrs. Blossom asks Danny to open Harold's golden locket charm and read the message inside to her.

Muriel Blossom's first transatlantic vacation begins with a charming encounter with Allan Turner, who covertly uses her to smuggle stolen jewels through customs. When Allan turns up dead in Paris, Mrs. Blossom reluctantly accepts help from the mysterious Danny Johnson, who claims to be an FBI agent tracking a stolen Pakistani statue called the Quqnoz. Aboard a Seine cruise, a web of art theft and murder tightens around her as she grows suspicious of the passengers closest to her. After Danny is dramatically framed and arrested, Mrs. Blossom alone pieces together that Allan's so-called melatonin gummies are actually the statue's missing sapphires. In a climactic balcony confrontation, she outsmarts and physically overpowers the criminals, saving herself and her friend Elinor. She returns home to Baltimore a changed woman, finally ready to embrace her independence and the future.

The headline events of Muriel Blossom's perilous Seine cruise.

Mrs. Blossom finds a discarded lottery ticket in a Maryland convenience store parking lot that turns out to be worth nearly nine million dollars.

Allan confesses over dinner at a London restaurant that the gummy he gave Mrs. Blossom on the plane was cannabis, not melatonin.

Mrs. Blossom hides Allan's salmon-colored gummies alongside her diamond earrings in the secret compartment of her pillbox to avoid customs scrutiny.

In a Paris restaurant, Mrs. Blossom confronts the man who stared at her on the train, and he introduces himself as stylist Danny Johnson.

Danny lies to Paris police that he is Mrs. Blossom's son and follows her when she goes to identify Allan's body.

Danny takes Mrs. Blossom to the atelier of his designer friend Cece, who fits her with a bold new caftan and accessories.

Mrs. Blossom follows a suspicious fake bellman from her Paris hotel and spots him meeting Danny and another man at a nearby café.

Mrs. Blossom and Elinor are assigned the largest stateroom on the Seine cruise ship, complete with its own private balcony.

Mrs. Blossom meets wealthy, elegant passenger Pat Siemen on the cruise ship's upper deck, and the two bond as kindred spirits.

After the Vétheuil day trip, Mrs. Blossom finds a GPS tracking device planted among her belongings and suspects Danny placed it there.

Mrs. Blossom and Elinor return to their stateroom to find someone has thoroughly searched their belongings during their absence.

During a D-Day documentary screening, Mrs. Blossom covertly transfers the GPS tracker from her own purse into Pat Siemen's bag.

The Seine cruise is delayed following Danny's arrest, forcing Mrs. Blossom to cancel her private dinner date with Paul in Paris.

Mrs. Blossom visits Pat Siemen in the hospital under police supervision, where Pat admits that Marko is her lover, not her brother.

Mrs. Blossom secretly records then deletes her conversation with Pat and lies to Danny by telling him Pat knows nothing useful.

Mrs. Blossom's adventure begins before departure, when a found lottery ticket makes her a millionaire and funds her first European vacation. In London and Paris, she navigates Allan Turner's deceptions and Danny Johnson's shifting cover stories, while a bold new wardrobe from designer Cece begins to rebuild her long-suppressed confidence. Aboard the Seine cruise, she bonds with elegant passenger Pat Siemen and watches her friend Elinor fall for the mysterious Marko, even as their stateroom is secretly searched. Suspicious of Danny, Mrs. Blossom plants his GPS tracker in Pat's bag and contacts her private investigator friend Tess Monaghan for help cracking the mystery. After Danny's dramatic arrest delays the cruise and costs her a dinner date with the charming Paul, the criminal conspiracy reaches its violent climax. In the aftermath, Mrs. Blossom visits Pat in the hospital and makes a compassionate choice to protect her most painful secrets.

The supporting scenes and subplots woven through Mrs. Blossom's adventure.

On the Chunnel train, Mrs. Blossom realizes Allan gave her the wrong time zone in London, meaning she could have caught her Paris flight.

Mrs. Blossom returns to her Paris hotel to discover her room has been methodically searched, though nothing appears to be missing.

A trench-coated man follows Mrs. Blossom from a Paris art exhibition, and she escapes him by pushing through a dense crowd.

Mrs. Blossom reunites with childhood friend Elinor to begin the Seine cruise but decides not to mention Allan Turner's mysterious death.

Marko joins Mrs. Blossom and Elinor's dinner table on the cruise ship and directs his attention almost entirely at Elinor.

At a shipboard D-Day lecture, Mrs. Blossom learns that Pat Siemen shares a stateroom with Marko and that he is her brother.

Pat Siemen tells Mrs. Blossom during a conversation on the upper deck that everyone deserves to be the main character in their own life.

Elinor excitedly tells Mrs. Blossom that Marko has finally slept with her and that she is falling in love with him.

Mrs. Blossom discovers that Paul's cruise cabin is now occupied by a crew member who claims to have been there the whole time.

A shipboard mentalist's trick at the farewell dinner triggers Mrs. Blossom's memory of Allan's cryptic text about her having someone's eyes.

Marko enters Mrs. Blossom's stateroom carrying an intoxicated Elinor, trapping Mrs. Blossom and Pat together on the private balcony.

Marko produces a gun and forces Elinor toward the balcony's edge to coerce Mrs. Blossom into surrendering the stolen sapphires.

After Marko goes overboard, Mrs. Blossom wrenches Pat Siemen's cane away and shoves her to the floor to prevent further attack.

Mrs. Blossom reaches into her pocket and produces the seven hidden sapphires, handing them to Danny for return to Pakistan.

Back in Baltimore, Mrs. Blossom runs into Danny at the very bistro where Allan Turner had once promised to take her for dinner.

The mystery begins to unfold when Mrs. Blossom realizes mid-journey that Allan deliberately stranded her in London, and deepens when she returns to her Paris hotel to find her room has been searched and a stranger is following her from an art exhibition. Boarding the cruise, she is drawn into the ship's social world—watching Elinor fall recklessly for Marko, receiving Pat Siemen's advice to be the main character in her own life, and noting the unsettling disappearance of the charming Paul. A mentalist's trick at the farewell dinner triggers the crucial mental connection between Allan's cryptic text and the Quqnoz's missing ornaments, and moments later Marko arrives at her stateroom with a drugged Elinor, forcing the climactic confrontation. Mrs. Blossom outmaneuvers the criminals with a feint and surprising physical force, then hands the recovered sapphires to Danny to complete his mission. The story closes in Baltimore with Mrs. Blossom finally at peace with her past and ready to live fully on her own terms.