An undercover marshal wants to arrest famous bandit Kao Pao Tien, and he wants his daughter to help him find the castle where the bandit lives. He mistakes a young lady for Kao Pao Tien's daughter and saves her life while she is in an inn where she met her father's friend, who was Kao Pao Tien's man. She discovers that Kao Pao Tien was her mother's brother-in-law and that he tried to rape her once when he was drunk. He fought with the young lady's father and hurt her mother with a poisoned dart. During the 18 following years, the lady's father trained her to fight in order that she takes revenge for her mother's death.