D.O.A.

An opening sequence features Frank Bigelow walking through the long hallway of a police station to report his own murder. From here to the end, the story is told in flashback. Bigelow is a hard-driving accountant and notary public in Banning, California, who decides, to the chagrin of his secretary who is in love with him, to escape alone for a fun vacation in San Francisco. At the hotel, he is invited to join a group of conventioneers for a night out. He ends up at a nightclub, where unnoticed, a stranger swaps his drink for another one. The next morning, he feels extremely ill. Doctors determine that he had ingested poison, a "luminous toxin", for which no antidote is known.

With only days to live, Bigelow embarks on a desperate search to discover the motive for his poisoning. A call to Paula provides a possible lead; a Eugene Philips has been urgently trying to contact him. Bigelow travels to Philips' import-export company in Los Angeles, meeting Halliday, the company comptroller, who says that Philips has committed suicide.

Bigelow locates Eugene Philips' widow and brother Stanley Philips. Months earlier, Eugene had purchased iridium, a rare, platinum-like metallic element, which had been stolen by a criminal named Majak. The seller was a George Reynolds (or Raymond Rakubian), Majak's nephew. As a result of this illegal sale/purchase transaction, Eugene Philips faced criminal charges.

The bill of sale would have cleared Eugene, but it has gone missing, and that document had been notarized by Bigelow himself. He learns that Reynolds/Rakubian is now dead. He realizes that someone seems intent on eliminating all evidence of this sale.

That someone turns out, in a plot twist, to be Halliday. Stanley Phillips, who has now been poisoned, reveals that Eugene discovered that his wife and Halliday were having an affair. Mrs. Philips affirms that during a confrontation that turned violent, Halliday threw Eugene over a balcony. To make it look like suicide, the pair insisted that Eugene had killed himself over his legal troubles. When they discovered that exonerating evidence of his innocence existed in the notarized iridium bill of sale, Halliday began disposing of anyone knowing about the document, and that led to Bigelow.

In the final scene, Bigelow tracks Halliday to the Philips company and finds him wearing the same distinctive coat and scarf as the man who switched the drinks. Halliday draws a gun and fires first, but Bigelow fatally shoots him.

Bigelow finishes telling his story and dies. The police detective taking down the report instructs that his file be marked "dead on arrival".

Frank Bigelow discovers Halliday is the murderer, confronts him, and fatally shoots him before succumbing to the poison himself.

The ending completes the tragic arc: Bigelow’s relentless quest for answers ends with justice served, but at the ultimate personal cost. By reporting his own murder, Bigelow ensures the truth is known, bringing closure even as he dies. It’s a classic noir conclusion—fatalistic, morally ambiguous, and soaked in existential dread.