Under heavy police protection, gangster Joe Rico, Ted de Corsia, arrives late at night at the courthouse to testify against crime boss Albert Mendoza, Everett Sloane. There have already been several attempts on Rico's life, and the lead prosecutor Martin Ferguson, Humphrey Bogart, reminds him that he himself faces plenty of charges unless he cooperates. After yet another attempt on his life, Rico slips away from his bodyguards but plummets to his death from the ledge outside the eighth-floor window. The loss of Rico’s testimony threatens to let Mendoza walk free, and the case suddenly hinges on pieces that may not be admissible at trial.
With Rico gone, Ferguson believes something else has surfaced in the investigation that could still indict Mendoza, so he partners with police captain Frank Nelson, Roy Roberts to reopen the files. Much of what unfolds comes in flashbacks, painting a portrait of how the web of murders was spun and how the city’s crime network operated. The memory-driven reconstruction centers on the early, chaotic moment when small-time gangster James "Duke" Malloy, Michael Tolan, bursts into a police station and claims to have killed his girlfriend under coercion from others. The police soon discover only an empty grave and Malloy’s subsequent suicide in his cell, a mystery that pulls Ferguson deeper into the case.
Ferguson re-examines Malloy’s associates and is drawn to the enigmatic figure known as "Big Babe" Lazich, Zero Mostel. Lazich refuses to talk until Ferguson threatens dire consequences for his wife and his son, and only then does the confession arrive: Lazich has been carrying out orders from Rico, taking murder orders by telephone and passing them along for profit. The revelation shifts the focus to a scheme in which killers act as hired hands for a client who maintains a perfect alibi, leaving no motive and little to trace. Rico, it seems, is the only one who knows who the true mastermind is.
Lazich then leads the investigators to a grim discovery—the body of Nina Lombardo, Susan Cabot. She turns out to be a contract victim whom Malloy was supposed to kill, but who won his affections instead. The case grows colder and more tangled when Nina’s roommate Teresa Davis, Patricia Hayes, reveals Nina’s real name was Angela Vetto and that she had been hidden away for years after her father’s murder. The truth widens the circle to include a long-lost family history and a hidden identity at the center of the murders.
Soon the police uncover a mass grave stuffed with bodies, and the gang begins to buckle under pressure. Rico himself is found hiding on a farm with his last accomplices, and they are gunned down by hired killers trying to erase the evidence. Rico then contacts Ferguson, offering to testify against his secret boss, revealing that Tony Vetto and his daughter Angela witnessed Mendoza’s first murder, though there are now no surviving witnesses to press the case. The tension mounts as Ferguson confronts Mendoza with the possibility that the prosecution will hinge on fresh testimony rather than Rico’s initial evidence.
Back in the evidence room, Ferguson listens to a taped confession from Rico—an audio that is legallyistic ally delicate and not admissible in court. In that recording, Rico describes Vetto’s daughter as having "big blue eyes." Ferguson recalls that Nina Lombardo had brown eyes, while Teresa Davis had blue eyes, leading him to suspect that Nina had been misidentified as Duke Malloy’s contract. The realization aligns with Mendoza’s own instinct: a misidentified victim could derail the case against him.
As the plot thickens, Mendoza, aided by his attorney, acts on this new insight and dispatches two of his remaining henchmen to locate the real Angela Vetto. Ferguson and Nelson race to Angela’s residence, only to find she has stepped out to do some shopping. To reach her quickly, Ferguson uses a sidewalk loudspeaker from a nearby music store to broadcast a warning and directs Angela to contact him at the store. She heeds the call and promptly makes contact, prompting Ferguson to arrange a meet in a high-stakes showdown, with killers in close pursuit.
The confrontation that follows tightens the net around Mendoza. Ferguson manages to eliminate one of the attackers, and the other is captured. With Angela under his protection, Ferguson escorts her away to safety, ensuring her ability to testify against Mendoza and bringing the sprawling, dangerous conspiracy one step closer to its end. The film keeps its gaze on procedural detail, the shifting shadows of loyalty, and the fragile line between justice and corruption, delivering a tightly wound noir that traces how truth can be obscured by misidentifications, threats, and the endless hunt for a single, elusive mastermind.
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