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L'Etrangere (The Foreigner) is Mrs. Clarkson (Elvire Popesco), the wife of a wealthy American (Henri Debain). Mrs. Clarkson has entered into matrimony for the express purpose of accumulating a great deal of money. No, she isn't a spendthrift: She hopes to use the cash to finance a campaign of revenge, levelled against the man who seduced her own mother. Our heroine then makes it her mission in life to destroy all males who've caused the downfall and ruin of innocent females. Her campaign comes to an end when she falls in love with Mauriceau (Emile Drain), her husband's assistant, but there's no happy ending in the wings for this avenging angel.