In San Francisco, private investigator Sam Spade [Ricardo Cortez] and his partner are hired by Ruth Wonderly [Bebe Daniels] to shadow Floyd Thursby, a man she claims ran off with her younger sister. That very night, Detective Tom Polhaus informs Spade that Archer, his partner, has been killed while tailing Thursby. Shortly after, Thursby himself is killed, and the police quickly begin to suspect Spade of involvement in the double death.
The following day, Spade confronts Wonderly to learn more about her true motives, but she offers few solid details and keeps feeding him just enough to stay on the case. Meanwhile, Dr. Joel Cairo [Otto Matieson] comes to Spade’s office with a tempting offer: $5,000 to retrieve an enamel figurine of a black bird, which Cairo claims is tied to the case’s larger mystery and its rightful owner. Spade pretends to play along, even as he decides to keep his own cards close.
That evening at Spade’s apartment, Wonderly sleeps as Spade shares the details of his conversation with Cairo, and the tension rises. Polhaus and Lt. Dundy arrive again, only to be interrupted by Wonderly’s sudden outburst as she grabs Cairo at gunpoint. The next morning, Spade quietly searches Wonderly’s apartment with her latchkey, but finds nothing that clears the fog around her.
A note arrives inviting Spade to a rendezvous with Casper Gutman [Dudley Digges], a suave and calculating figure who claims to know the bird’s history and its extraordinary value. At a smoky bar, Gutman unveils the tale of the enigmatic black bird, a centuries-old statuette studded with jewels that several factions have fought to possess. Gutman is portrayed as the seed of the plot’s mastermind, and he hints that Spade might play a pivotal role in the game ahead. Cairo joins them privately and confirms that Gutman is not alone in his pursuit; Cairo himself is tangled up in the affair, and he hints at a plan that could change everything. Gutman’s conversation leaves Spade with a knot of conflicting loyalties and a sense that nothing in this case is quite as it appears.
That night, Gutman’s team closes in: Cairo and Gutman arrive with Wilmer Cook [Dwight Frye], a ruthless gunman, and they pressure Spade with a chilling offer—hand over the falcon and there will be money, plus assurance that the right people will walk away. Spade refuses to be playacting and instead pulls Gutman into a duel of wits, proposing that there must be a "fall guy" who will take the blame for the murders. Gutman agrees, and Spade suggests Wilmer as the patsy. The conspirators depart, leaving Spade to ponder the true ownership of the priceless statuette and the depths of Wonderly’s deception.
That same night, the La Paloma’s captain, Captain Jacobi [Agostino Borgato], arrives with the bag that is supposed to contain the falcon—but the bag carries not the bird but a corpse. Jacobi has been shot, and the corpse’s baggage reveals the falcon’s true predicament: the bird within is a fake. A frantic scramble ensues as the conspirators realize they’ve been tricked, and Gutman demands the real bird—or the next best thing. Spade sends for the baggage check receipts and ships the bag to himself, preparing to close the circle on the scheme.
Back at the office, Spade confronts Wonderly and accuses her of killing Archer to frame Thursby and move herself into the center of the action. Wonderly breaks and confesses; she admits that she orchestrated a web designed to secure a future at Gutman’s expense and that Archer’s murder was a calculated step in that plan. The police, led by Dundy and Polhaus, close in, and Wilmer Cook and Cairo’s fates collide in a brutal confrontation that leaves Wilmer dead and Cairo mortally wounded before they can be captured. Spade hands over Wilmer’s guns to the authorities and reveals Wonderly’s guilt, clearing the air of the immediate danger but leaving the moral ambiguities of the case to linger in the air.
In the aftermath, Spade visits Wonderly in prison to deliver the news that he has become the chief investigator for the district attorney’s office, a turn that seals his role as the arbiter of justice in this tangled case. He instructs the prison matron to treat Wonderly with special care—and when she asks who will pay for it, Spade wryly replies that he’ll “OK it,” a final, sharp line that underscores the cynical, hard-boiled tone that threads through the story. The case closes with Spade stepping into a position of power, leaving the city to ponder who truly held the power in the hunt for the falcon, and at what cost.
- Effie Perine, Una Merkel, Spade’s secretary, appears behind the desk in one tense moment as the office quiets after the day’s revelations.
- The prison matron, Lucille Ward, oversees Wonderly’s confinement with a wary eye as the truth about the Falcon’s custody comes to light.
- Dr. Joel Cairo [Otto Matieson] and Casper Gutman [Dudley Digges] are central to the web, their schemes driving the early moves of the case, while Dwight Frye as Wilmer Cook emerges as the lethal wildcard who shapes the final acts.
- The narrative threads through the city’s law and order world, with J. Farrell MacDonald as Det. Sgt. Tom Polhaus and Robert Elliott as Lt. Dundy enforcing the law as the truth finally comes to light.
- The shadow of the District Attorney, played by Morgan Wallace, looms over the investigation as Spade navigates a maze of deception, crime, and shifting loyalties.
