Irwin Maurice "Fletch" Fletcher, portrayed by Jon Hamm, finds himself in a tangled web of art theft and kidnapping as he travels from Italy to Boston at the request of his girlfriend, Angela, played by Lorenza Izzo. Angela's wealthy father, an Italian count, has enlisted Fletch to recover a collection of invaluable paintings that have been stolen by Ronald Horan, an American art dealer, played by Kyle MacLachlan.
The story takes a twist when Fletch realizes that the count's new wife, Countess Sylvia de Grassi, portrayed by Marcia Gay Harden, may be involved in the scheme. With nine paintings missing, including a Picasso estimated to be worth $20 million, Fletch's race against time intensifies when he learns the count has been kidnapped by mobsters seeking the Picasso as ransom.
Upon arriving in Boston, Fletch's investigations lead him to a grisly discovery: a dead woman, later identified as barista Laurel Goodwin. In an ironic turn of events, Fletch, despite being the one to contact the police, becomes the prime suspect in her murder, with Sergeant Inspector Monroe (Roy Wood Jr.) and Junior Detective Griz (Ayden Mayeri) closely monitoring his every move. Fletch tries to clear his name by passing himself off as a freelance journalist researching a book on art, yet his troubles compound as evidence continues to mount against him.
Using a false identity, Fletch arranges a meeting with Horan, who claims he can procure the missing Picasso. Meanwhile, he gathers potential suspects surrounding the case—Eve, his neighbor, and Owen, the townhouse's previous owner with a violent past. Moreover, he discovers that Owen's estranged spouse, Tatiana, may also hold vital clues in solving the case. Aggravating matters, the Countess decided to stay with Fletch, much to Angela's chagrin as suspicions regarding her marriage to Angela’s father arise.
Fletch's investigation leads him to discover that Horan is concealing the stolen paintings on his yacht. When confronted, Horan demands an exorbitant sum for the Picasso, which triggers a series of deadly encounters. After breaking into Horan's yacht, Fletch retrieves all the stolen artwork, only to find himself embroiled in yet another murder plot at a chaotic dinner with Angela, the Countess, and several suspicious guests.
As the plot thickens, Fletch follows Angela to a secret meeting with Horan, where shocking revelations unfold—including the truth about Owen's ties to the art heist and Laurel's untimely death. Angela's betrayal hits hard as Fletch learns she had an active role in the crime. In a climactic showdown, Horan's ruthless attempts to silence Fletch are thwarted, leading to his own demise.
In a twist ending, the Count reveals that his kidnapping was a test for his wife and daughter, and Fletch's assistance proves invaluable. In a generous gesture, Fletch decides to send paintings and a financial gift to those affected, thereby closing the chapter on a crazy whirlwind of art theft and emotional deception.
