Kathie Rauch from Milwaukee, Wisconsin sends a letter to the German Embassy in Washington, D.C., claiming the German zeppelin Hindenburg will explode while flying over New York City during its first flight of the season. To guard against this threat, Luftwaffe Colonel Franz Ritter, George C. Scott, is named security officer to protect the airship as it prepares for its voyage. He is aided by a Nazi government official, SS/Gestapo Hauptsturmführer Martin Vogel, Roy Thinnes, who poses as the ship’s official photographer. Together, they quietly probe the backgrounds of passengers and crew, each keeping their own counsel even as they pretend to work in tandem.
Ritter has reason to be wary of almost everyone aboard, and among the most intriguing figures is Countess Ursula von Reugen, Anne Bancroft, whose Baltic estate at Peenemünde had been seized by the Nazis for weapons testing. She appears to be fleeing Germany while visiting her young hearing-impaired daughter in Boston, a detail that makes her a focal point for Ritter’s suspicions. The list of potential suspects widens to include Edward Douglas, Gig Young, a shrewd German-American advertising executive; Emilio Pajetta, Burgess Meredith, a card sharp with a knack for reading people; and Major Napier, René Auberjonois, along with several crew members and even the Hindenburg’s own captains, such as Captain Pruss, Charles Durning. As the tension builds, the ship’s atmosphere thickens with mystery and misdirection.
Hints and half-truths pile up as the investigators chase clues that ultimately prove to be red herrings. Joe Spah, Robert Clary, sketches the ship’s interior in a way that could inspire a vaudeville routine, and passenger bets on horse names surface as if they conceal something more meaningful. A pair of coded phrases—“carnivorous air” and “sea animals”—turn out to point not to people but to the ship itself and the Queen Mary, where a rival businessman races to outpace Edward Douglas in a high-stakes deal in New York. The pressure intensifies as the airship nears Lakehurst, and Vogel begins to act behind Ritter’s back, arresting Boerth and confiscating the Countess’s passport.
As Lakehurst looms, Ritter and Vogel’s uneasy partnership strains under the weight of a dangerous game. Boerth, a former Hitler Youth leader who has grown disillusioned with the Nazi regime, becomes the prime suspect in the growing crisis. Boerth is brought into the orbit of the investigation; his fate becomes intertwined with the Countess’s safety, and the tension between loyalty and conscience comes to a head. The revelation of a personal tragedy—Vogel torturing Boerth in the cargo hold, followed by Ritter’s intervention—pushes the saga toward a drastic climax. Boerth, badly burned and injured, dies of his injuries after freeing the Dalmatian dog that had been kept with the Channing family, while the Countess survives and is reunited with her daughter.
In the final act, the bomb that could devastate the airship becomes the pivotal obstacle. Ritter discovers that the device is hidden in the repair patch of gas cell 4, and a frantic struggle ensues as Vogel fights to stop him. With the clock ticking, Ritter detonates the device to prevent a catastrophe, sacrificing himself in the blast. Vogel is hurled down the catwalk but survives, badly burned, to be carried away by ground crews once the airship crashes to the ground. Boerth’s burns claim him as well, yet he has managed to free the Dalmatian and, in his last moments, to assert a quiet resistance against the regime. The Countess survives and is spared the worst of the disaster, reuniting with her daughter.
The aftermath is framed by newsreel footage and a steady narration that lists survivors and casualties, while offering various theories about what happened. As Herbert Morrison’s famous radio commentary plays, the wreckage is scrutinized for the inquiry, and the Hindenburg appears once again in the skies—only to fade back into the clouds as the credits roll.
