The story takes place on the eve of the outbreak of the world war, the Englishman Richard (Robert Powell Robert Powell) is an engineer, by accident, he got the password left by the former British agents, and with a strong sense of justice, he decided to expose the assassination plot planned by German spies, so he was violently hunted by German spy agencies. In this way, Richard embarked on the journey of escape, on the way, he met the congressman's daughter Pamela (Karen Dotrice), Pamela provides protection and help for Richard in danger, in the process, the two people who attract each other gradually come together. With the help of Pamela, Richard finally connected with the police and counterespionage agencies and deciphered his password at a critical moment. He went to the computer room of the London clock, where he found the switch to control the terrorist bomb and saved thousands of lives.