Mike Merrick (Audie Murphy), a proven and successful U.S. agent, receives a dangerous assignment that takes him to North Africa. There he pretends to be a German citizen with the name Ludwig Baum and is thus infiltrated into a highly secured research center. This is led by Professor Schlieben (George Sanders), who is working there for the Egyptian army on a dangerous nuclear missile. It is intended to serve a coup that could also spill over to other states. Mike is supposed to destroy the rocket plans. While carrying out his assignment, Mike meets Helga (Marianne Koch), the professor's daughter, and falls in love with her. This is an advantage, because in this way he can persuade her to help him stop her father's plan ...