American adventurer Michael Reynolds is hired by an international espionage ring to smuggle a noted scholar and resistance leader, Professor Jansci, out of Communist-ruled Hungary. Reynolds goes to Vienna to see the professor's daughter, Julia, and he persuades her to accompany him to Budapest. Once there, Reynolds is kidnaped by freedom fighters who take him to the professor's secret headquarters. Meanwhile, one of Jansci's trusted aides is captured by the Hungarian Secret Police and forced to reveal the professor's hiding place. Reynolds, Julia, and Jansci are quickly rounded up and taken to Szarhaza Prison, where they are tortured by the sadistic Colonel Hidas. They are rescued by a resistance fighter known as The Count, who tricks the Communists into placing the prisoners in his custody. At the last moment the ruse is discovered, and The Count is killed as the other three race to the airport where a chartered plane is waiting. Hidas pursues them but is killed in an accident on the runway. Safe at last, Reynolds, Julia, and the professor leave Hungary.