1944年，贝尔格莱德从德国占领下解放了出来。但是，人们不知道危险在等着他们，因为法西斯在撤退时决定炸毁城市·········

The robotic alien villains from Il était une fois... l'espace (1982) attack Earth.

A boxer dies in the prizefight ring, and detective Mr. Moto is called in when it turns out to be murder. What Moto uncovers, with the help of Charlie Chan's son Lee, is a gangland gambling racket.