On a rainy night in New York City, Adrienne Davis waits for a “blind date” at an elegant restaurant. She makes eye contact with a handsome diner across the room and suspects he is the unknown suitor, but the waiter informs her otherwise. After some time, she leaves the restaurant alone. The next morning, the handsome diner stops by Adrienne’s art restoration studio and introduces himself as Jack Saunders, an art acquisitor. Instantly captivated with each other, Jack and Adrienne spend the entire night talking and laughing. In the morning, they kiss. Six years later, the couple celebrate their daughter Mary’s fifth birthday. After the party, Jack and his daughter look through a photo album containing pictures of Jack’s childhood in Nebraska. A few days later, Jack and Adrienne attend a gala event at the Founders Museum, an art museum specializing in antiquities. There, they greet their friend, Harvey Schwartz, who is a restorer at the museum. Later, Adrienne asks if she can make a phone call in Harvey’s office. While wandering through the back rooms, she discovers the body of her friend and fellow art restorer, Tomasz, hanging from a ceiling fixture. When police arrive, Harvey and his colleagues suggest that their supervisor may have been depressed. Although Tomasz’s death is ruled a suicide, Adrienne is not convinced that her mentor killed himself. The next day at the museum, Harvey watches his co-worker, Jane, inspect an Egyptian necklace. That night, Jack informs Adrienne that the necklace, which he acquired for the museum, is a fake. Adrienne wonders if Tomasz swapped the real necklace for the fake one, before killing himself out of guilt. Just then, Jack announces that he must go to Boston, Massachusetts, to attend an art auction. In his absence, Adrienne meets her co-worker, Charlotte, at a Manhattan hotel to inspect a ceiling mural. Charlotte claims to have seen Jack in the lobby, but Adrienne dismisses the suggestion. When Jack returns home, he presents his wife with a gift of lingerie. Later, the couple celebrate their sixth wedding anniversary in the company of friends. Alone with Harvey, Adrienne asks why he looks so glum. Harvey explains that the museum traced the forgery of the necklace to a man named Daniel Sherman. Suspecting Thomas knew the criminal, he sorted through the dead man’s bank statements, but found nothing out of the ordinary. Harvey worries that the unresolved mystery makes everyone at the museum a suspect. Later that night, Adrienne awakens to find her husband in the midst of a heated telephone conversation. However, Jack tells her not to be concerned. A few days later, Adrienne receives a phone call from the lingerie store informing her that Jack left his credit card there. She frets about retrieving the card from Boston, but the clerk clarifies that the store is located in Manhattan. When Jack returns home, Adrienne accuses him of lying. They argue, until Jack leaves the house. He drives through lower Manhattan and picks up a passenger. Later, the car speeds down a winding snow-covered road, before careening over an embankment and bursting into flames. At the hospital, Adrienne tearfully identifies Jack’s wedding ring and watch. A few weeks after the funeral, the Saunders’ housemaid, Lillian, finds an exotic necklace on the floor of the closet and places it among Adrienne’s jewelry. Meanwhile, a clerk at the Social Security office tells Adrienne that the “Jack Saunders” associated with her husband’s social security number died sixteen years ago. Perplexed, the widow stops at the library and looks up the deceased Nebraska man named “Jack Saunders.” When she returns home, she peruses her husband’s family photo album while Mary and a friend play with her jewelry. Engrossed in the photos, she does not notice when Mary’s playmate puts on the Egyptian necklace. The next day, Adrienne visits the records office, where a high school yearbook photograph confirms that “Jack Saunders” was not the man she married. However, Jack’s classmate “Frank Sullivan” looks strikingly similar to her husband. The next day, Adrienne visits the real Jack Saunders’ cousin, Evelyn. The woman reminisces about Frank Sullivan, Jack’s charismatic best friend, and how he won her affection by staying up all night talking to her. Adrienne is stunned. Evelyn recalls Frank’s mother’s address, and a few days later, Adrienne pays the elderly woman a visit. Frank’s mother is openly derisive of her son, calling him selfish. That night, Adrienne comforts her daughter, who believes there is a man in the house. The next day, their apartment is ransacked, and Adrienne finds Lillian, the housemaid, barely alive in the bathroom. Adrienne returns to Mrs. Sullivan’s house, where, to her surprise, her husband awaits. He claims he meant no harm in taking his dead friend’s identity, but when an art forger named Daniel Sherman deduced what he had done, the man blackmailed him into stealing pieces from the museum and replacing them with fakes. Jack asks Adrienne to locate the original Egyptian necklace, and she returns home to search for it. While rifling through Jack’s briefcase, she finds an identification card showing his picture but bearing the name, “Daniel Sherman.” She takes a cab to the address listed, and meets Daniel’s wife, who is also an art collector. Adrienne sees a wedding portrait of her husband and the woman, and becomes further upset on noticing a picture of her own daughter, Mary. Just then, Jack calls and asks to speak to Adrienne. He informs her that he has taken custody of Mary, who has revealed that her playmate took the Egyptian necklace home. Jack tells Adrienne to obtain the necklace and meet him at their apartment later that night. There, he attempts to manipulate her into thinking he still loves her. When they kiss, Adrienne stabs him with a kitchen knife, before running from the apartment. A chase ensues through the unoccupied floors of the building, until Jack falls down an elevator shaft and dies. Sometime later, Adrienne and Mary move out of their apartment. The girl asks to keep her father’s photo album, and Adrienne suggests she pack it in her suitcase.