The Crimson Ghost casts a long shadow over a university town as a daring plan unfolds around the Cyclotrode X, a remarkable device engineered to repel atomic bomb attacks and to disrupt electrical systems. Its inventor, Dr. Chambers, demonstrates the device at a faculty meeting by making a model airplane drop from the sky, proving that the Cyclotrode can detect and neutralize a threat in real time. The moment is interrupted when two of the Ghost’s henchmen attempt to steal the prototype, and in a tense clash, Dr. Chambers destroys the device to prevent its capture. A criminologist named Duncan Richards arrives to help, engaging the assailants in a quick, hard fight. One of the henchmen, a figure named Ashe, manages to escape, while the other is killed when a collar around his neck is removed, signaling the Ghost’s chilling method of control.
With the threat still looming, Dr. Chambers gathers his colleagues—Duncan Richards, Anderson, Prof. Van Wyck, Maxwell, and Prof. Parker—to reveal that a duplicate Cyclotrode has already found a home in a bonded warehouse. The plot thickens as Chambers is drawn into the Ghost’s mansion hideout, where the villain forcibly places a control collar on him, bending his will to the Ghost’s commands. Under this coercive grip, Chambers is forced to retrieve the duplicate Cyclotrode from the warehouse, while Duncan Richards pursues in a high-speed car chase, desperately trying to keep up with the treacherous trail.
The Ghost orders Chambers to use the Cyclotrode to cripple Richards’s car, driving the chase toward a cliff’s edge, where Richards narrowly escapes disaster. Back at their hideout, the Ghost exercises his full influence over Chambers and pushes him to conceive something even more devastating: a larger, city-cracking Cyclotrode. Instead, Chambers engineers a deadly trap—an intense death ray—but when Richards finally locates the lair, Chambers sacrifices himself to save his colleague, leaping into the ray’s path and becoming a casualty of the very weapon he helped create. The Ghost, learning of Chambers’s death, resolves to build an even more formidable Cyclotrode in his own laboratory.
A new setback arises as the Ghost’s henchmen fail in separate attempts to obtain heavy water and a shipment of refined uranium, both crucial to the device’s operation. In a bid to expand his influence, the Ghost captures Diana Farnsworth, a secretary who has aided Richards, and places a control collar on her to ensure her compliance. Duncan Richards notices the collar and, with help from a doctor and a nurse, manages to remove it without harming Diana, only to discover that the seemingly ordinary doctor is actually Ashe’s ally in disguise.
Ashe, the masked foe, escapes in a car and heads to the Ghost’s mountain hideout, where a laboratory run by Bain has devised a way to manufacture heavy water without uranium. Richards follows the trail to the hideout, engages in a brutal struggle, and a fire breaks out, allowing the Ghost and Ashe to escape with a supply of heavy water. Returning to campus, Richards announces that the wreckage from the Ghost’s lab has been sent to a warehouse for fingerprint checks, but his real aim is to flush out the mastermind behind the plot.
When the warehouse investigation leads to a confrontation with Prof. Van Wyck—whom they initially mistake for the Ghost—things turn bloody as Van Wyck is slain in the melee. With both Anderson and Van Wyck dead, Richards narrows the suspect pool to either Maxwell or Prof. Parker. A dog tracks Ashe to the Ghost’s mansion, where Richards bursts into the estate’s secret lab, only to find that the Ghost and his henchmen have built an even larger Cyclotrode.
In a climactic confrontation, Richards fires at the new machine, shatters it, and unmasks the Crimson Ghost, revealing him to be Prof. Parker. The town breathes a sigh of relief as the evil plot collapses, and the university’s faculty and Diana look to the future with renewed vigilance, knowing that the threat of a single dangerous invention—and the man who would wield it—has finally been neutralized.
