During the Cold War between the two great powers of the United States and the Soviet Union, the Soviet Union adopted a mysterious telephone brainwashing plan to send a group of trained spies to various parts of the United States, and then disguised as ordinary people to live a normal life there. be prepared to wake them up when needed. But many years later, relations between the United States and the Soviet Union improved, but the spies were awakened by some people with ulterior motives using mysterious movie phones. In order to save the situation, the Soviet military sent a Soviet secret police named Gregory Bursov to the United States to deal with the disaster caused by the plan, and the United States also sent counter-espionage expert Barbara to help Bursov complete the task. In the process of investigating the truth, two people whose identities are hostile to each other have subtle feelings. In the end, they were willing to give up their spy status and live a civilian life together. Director Don Siegel uses sophisticated techniques to shoot a number of exciting action scenes, and also shows the annoyance of his espionage career, which is one of the masterpieces starring Charles Bronson.