Hans Herwig

Widowed at the age of twenty, Madame Boissière is a real mother hen, excessively brooding over her two sons Robert and Claude. She spoiled the marriage of one and kept the other away from any female presence. The latter runs off and marries a girl from the mountains. When his brother dies, the couple agree to return to live with Madame Boissière, who tries to separate them.

In Shangai, the "Green Dragon" threatens to kill Herbert Aboody, a rich exporter, unless he pays him 50,000 dollars. One of Aboody's secretaries calls inspector Wens for help. An amazing fact occurs, Wens kills Aboody and then disappears. What is the key to this mystery?

Nicole Montigny leaves her husband, surgeon Paul, to live with her lover in Canada. Anna, her husband's assistant, thinks she can take advantage of the situation to console the man she loves. She convinces Nicole to fake an accident. However, Paul starts seeing his wife's twin sister, Mireille. Anna, mad with jealousy, brings Nicole back and tries to break up the new couple by blackmail. Nicole decides to eliminate Anna.