Herbert Scott is kidnapped, and his nephew Larry Scott pays the ransom but the uncle is not released. The Scotts’ lodge caretaker, Kimble, intercepts the payoff and stuffs the cash into empty shotgun shells. When Kimble is killed while trying to contact Larry Scott, the nephew decides to investigate with his friend Don and heads up to the lodge. The tension climbs as the landscape tightens around a web of secrets and false leads, and every shadow could hide the next clue or a new danger.
Betty Mason, an FBI agent, goes undercover as a writer and checks into the inn near the Scott lodge. The crooks, in league with Sam Hathaway, grow wary of the unfamiliar guest and keep her under careful surveillance. Betty’s instincts push her to observe more closely, and she slips out a window to tail the conspirators, then slips back to gather fresh information. From her vantage, she overhears a crucial exchange and learns that Sam has deduced where the money is hidden.
Her pursuit leads Betty to the store where Kimble had left the shell-filled box, only to discover the box has been inexplicably redirected to Larry Scott’s home via a groceries delivery. With quick hands and sharper wits, she gets the drop on two crooks and binds them, turning them over to the local constable for processing. The momentum shifts as Betty races back toward the lodge, but Sam spots them with the money and fires through a window, scattering the pursuit and heightening the peril for everyone nearby.
Don and Betty give chase, allowing Larry Scott to hold the money for the moment. Betty’s return to the scene is dramatic: she finds Larry trapped, a secret door slowly sliding shut, and a desperate struggle that ends with Larry fighting his way through to safety. In a brutal moment, Larry hacks at the door with an axe and descends toward a cave where Sam and the remaining crooks have a tense confrontation over their cut. Sam is killed in the fray, and the two crooks scatter, while Larry and Betty race into the cavern after them.
The plot thickens as Larry moves through the cave, chasing the fleeing crooks and trying to reach the money. Betty works to untie Herbert Scott, who’s been bound to a post, while Don returns to lend his support and is sent off with the freed uncle to keep him out of harm’s way. The confrontation in the cave reaches a fever pitch, and Larry delivers a decisive blow to the last pursuer, finally securing the cash—only for the two remaining criminals to evade immediate capture by the constable and set fire to the mill in a chaotic distraction.
With the money in hand and time running out, the surviving crooks seize a car and flee, pursued by Betty’s partner Morrison, who arrives in response to her telegram. A high-speed chase ends with a sharp confrontation on the road as police close in, and the danger shifts from the cave to the mercy of the law. In the final surge, the police manage to drag the crooks off the road, rescue Betty, and recover the cash, turning the moment of triumph into a chance to save both Larry and Betty.
In the aftermath, the immediate danger subsides and the town breathes a cautious sigh of relief. The officers ensure the money is secure, the crooks are brought to justice, and the threads of the case are tied up cleanly. The film closes on a note of hopeful transition: with danger behind them, Larry Scott and Betty find a new horizon together, and the plan for their future begins to take shape as Larry heads toward Hawaii for their honeymoon, a calm counterpoint to the chaos that preceded it.
