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As the rebellion against oppression rages in China, Chinese-American sympathizers in San Francisco prepare a shipment of war materiel to be smuggled to their homeland. Faced with losing the shipment unless he can raise $100,000 in four days, Sin Kai appeals to his people for urgent help, even though his nemesis, The Sea Crab, the secret identity of wealthy merchant Fen Sha, will stop at nothing to prevent the ship's sailing. Despite their concern for China, Dr. Dong Tong and his beautiful daughter Lien Wha have a happy life. When Lien Wha falls in love with a poor young university student named Tom Lee, Tong's affection for his daughter outweighs his concerns for traditional Chinese courtship and he gives permission for them to marry. Soon, however, Sin Kai tells Tong that he must obtain a $25,000 marriage settlement for Lien Wha to give to the cause in compensation for the fact that he has no son to offer. Sadly, Tong agrees, as does Lien Wha, though she and Tom Lee are heartbroken. Even the revelation by Sin Kai that Tom Lee is really Prince Chun, the heir to an important position in the rebellion, cannot alter their duty. After hearing that three other girls have come to an unfortunate end in similar situations, Tong has a change of heart, but Lien Wha encourages her suitors to bid more for her until Fen Sha offers $100,000. Because of her sacrifice, Tong calls her his "son-daughter," a title she accepts proudly. After the wedding, Fen Sha arranges for Tong to be robbed and murdered, then, because Sin Kai has poisoned himself after his capture, Fen Sha only needs to kill Tom Lee to prevent the arms shipment. Tom Lee secretly goes to Lien Wha, and they both overhear the details of Tong's murder. He then steals the money from Fen Sha's safe, but is wounded by a knife before escaping back to Lien Wha. Ater his death, Lien Wha strangles Fen Sha with his queue in their bridal chamber and sails to China with the arms shipment, having avenged her loved ones.