,
Myrna Loy and
Skippy (Asta) in
The Thin Man Dorothy Wynant informs her inventor father Clyde of her upcoming wedding. Later, Clyde discovers that
bonds worth $50,000, intended as a wedding gift for Dorothy, are missing from his safe. Immediately suspecting his mistress and former secretary, Julia Wolf, Clyde storms into her apartment and finds her in the company of another man, Joe Morelli. Julia confesses that she cashed in the bonds and has only $25,000 left. Clyde threatens to call the police unless she comes up with the other $25,000. Three months later, Nick Charles, a retired detective who once worked on a case for Clyde, is visiting New York City for Christmas with his heiress wife, Nora, with whom he lives in San Francisco. While in New York, Nick runs into Dorothy, who tells him that her father has disappeared after leaving on a secret business trip to an undisclosed destination, with a promise to return home before her wedding. Clyde's lawyer Herbert MacCaulay had been sending money to Clyde through Julia. Dorothy's mother and Clyde's ex-wife, Mimi, is now married to Chris Jorgenson, a penniless man, and has been living off Clyde's alimony payments. Mimi finds Julia murdered in her apartment and secretly removes Clyde's
watch chain from Julia's hand. Clyde becomes the prime suspect, but Dorothy refuses to believe that her father is guilty. Nick and Lieutenant John Guild visit an
informant, Arthur Nunheim, to question him, but he slips away down the fire escape. Later, Nunheim is on the phone blackmailing someone for $5,000 to keep quiet about the murder and leave town. When Nunheim arrives to collect the money, he is immediately shot and killed by an unseen assailant with what police find was the same gun that killed Julia. Guild deduces that Clyde committed both murders after Mimi hands over her ex-husband's watch chain. One night, Nick searches Clyde's closed shop for clues with his dog Asta, who discovers the skeletal remains of a body buried in the basement. Nick catches Tanner, Clyde's former bookkeeper and an ex-con once arrested by Nick, sneaking into the shop. Tanner admits to having embezzled money from Clyde, claiming he came to the shop to return the money. The police conclude that Clyde murdered Julia, Nunheim, and this newly discovered corpse, assuming that the remains belong to an old enemy of Clyde's, based on the clothes worn by the skeleton. While examining the body's X-rays, Nick notices an old piece of shrapnel in the corpse's leg. He theorizes with Nora that the body was that of Clyde himself, recounting that Clyde had shrapnel in his shin, and since he has been dead for a few months, he could not be a murder suspect. To expose the murderer, Nick invites all the suspects to a dinner party, including Dorothy, Mimi, Chris, MacCaulay, Morelli, and Tanner. Nick tells the dinner guests that he saw Clyde the night before—not revealing he means Clyde's corpse. When Mimi claims to have also seen Clyde the night before, Nick announces that the corpse was that of Clyde. He explains that Julia was embezzling from Clyde and splitting the money with Tanner. Clyde went after the man he thought was robbing him, and that man killed Clyde. The murderer buried Clyde's body with another man's clothes and wrote letters to MacCaulay, signing Clyde's name, so MacCaulay would continue to send money to Julia. The culprit murdered Julia, afraid that she might double-cross him, and planted Clyde's watch chain in her hand. He then murdered Nunheim since he had witnessed Julia's murder and was blackmailing him. The murderer bribed Mimi into claiming she had seen Clyde alive. MacCaulay drew up Clyde's will to cut Mimi off if she remarried. However, Mimi was never legally married to Chris as he did not divorce his former wife, so Mimi is no longer excluded from Clyde's will. As MacCaulay hides a gun under the table, Nick punches him out and declares MacCaulay to be the murderer. Later, Nick and Nora, along with Dorothy and her new husband Tommy, celebrate as they ride a train back to California. ==Cast==