Convicted murderer Stephen McNally as 'Turk' bursts through a washroom window and disappears into the bustle of a train pulling into Grand Central Terminal in New York, signaling the start of a twisting, high-stakes case. He phones his former girlfriend, Broadway star Patricia Dane as Mida King, and delivers a chilling threat to kill her. Panicked, she steps off her show between acts, slips away to a private train car on a siding, and plans to flee town to marry her wealthy fiancé, Mark Daniels as David V. Henderson. But the night ends in tragedy when her body is found by David and his ex-fiancée, Connie Furness.
Police Inspector Sam Levene is called in to untangle a tangle of secrets, while the doctor on the scene cannot determine a clear cause of death. Turk is recaptured, and the sharp-tinned private detective Rocky Custer Van Heflin, whom Turk had hired, is brought in to lend his streetwise eye to the investigation.
A web of suspects closes in around Mida’s circle: Ramon [Roman Bohnen], her scheming stepfather; her ex-husband Paul Rinehart [George Lynn], who works at the terminal; Frankie Ciro [Tom Conway], her producer; Pearl Delroy [Connie Gilchrist], her sharp-tongued maid; and Baby Delroy [Betty Wells], her young understudy. The plot thickens as Connie Furness’s wealthy father, Roger Furness [Samuel S. Hinds], arrives to safeguard his daughter’s interests, adding a layer of social power to the case. Gunther wrings confessions out of each person, aided by the weary wit of Rocky.
Beneath the surface, the victim is painted as a calculating gold digger who treated every relationship as a stepping stone toward a bigger prize. Her ultimate goal was to secure marriage to David, a milestone she hoped would fund an even more lavish show in the future. A crucial overheard moment—Frankie Ciro’s implication that Mida would extract a rich divorce settlement within about six months—plants a motive in David’s mind, setting the stage for a deadly unraveling.
As the inquiry widens, Ramon dies, seemingly from a weak heart, but Rocky quickly reveals that Ramon was murdered as well. The killer’s method becomes terrifyingly clear: Mida was electrocuted in the locked railway car’s shower by tying the plumbing to the electrified third rail. When the killer attempted to stash the wiring, Ramon happened upon him and was paid off, only to be disposed of later with poison, sealing the killer’s manipulation of everyone around them.
In the final, tense turn, Rocky identifies the mastermind as Samuel S. Hinds portraying Roger Furness. Roger makes a desperate break for a departing train, but his attempt ends tragically as he falls victim to the same third-rail fate he catalyzed, a grim echo of the power and danger tugging at the story from the rails to Broadway.
The case closes with Rocky’s keen deduction pulling back the curtain on a motive-driven murder set against a backdrop of wealth, status, and the perilous allure of a gold-tinted social climb. A sharp examination of deception, loyalty, and the costs of ambition, the tale lingers on the consequences of chasing fortune at any cost, from the crowded terminals of New York to the intimate shadows behind glamorous façades.
