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In the 1960s, Zhou Guixin, a college student with a poor background and the loss of her first love, angrily married Yang Fengzhi, a rural girl from a well-matched rich peasant family. She was forced to write a pledge: "I will never divorce my wife." She took her wife and daughter to a foreign country and devoted herself to the construction of the "Third Line" railway. In order to keep his promise and maintain his family, on the one hand, he endured all kinds of pressure in his career, studied hard, and worked hard. He grew from an ordinary technician to a national senior engineer, and joined the party with honor, making great contributions to the national railway construction. On the other hand, he tolerated all kinds of unreasonable things his wife did out of paranoia and never left her, staying together for life. His difficult life and unhappy marriage were understood and sympathized by his daughter Zhou Lifen. On his deathbed, he reunited with his first love and passed away peacefully. After her husband passed away, Yang Fengzhi lost all hope, saw through the world of mortals, and became a nun.

The new female detective Meng Di was ignorantly involved in a railway corpse case. With the help of captain Yu Zhennan and her partner Liu Hao, she traced the source of the body and found the victim's family member Ouyang Minghui. Then, starting from a broken leg brooch, he peeled off the silk and pulled out the cocoon, leading to the drowning case of a campus girl. He found that the psychology professor Fang Ruolan, whom he admired, had become a major suspect, and he was puzzled. In order to find out the truth, she encouraged Liu Hao to act without permission, break into the gem factory at night, and return to her alma mater to investigate and collect evidence. Unexpectedly, Ouyang Minghui, a family member of the victim, fell from the building before his eyes and fell unconscious. The case has reached a deadlock. Meng Di followed Yu Zhennan, clinging to clues and conducting in-depth investigations. Starting from the unfortunate experience of the homeless girl, he uncovered the secret of Fang Ruolan's illegitimate child that had been hidden for more than 20 years. He dug deep for clues and investigated the case to find out the motive for the murder. Through surprise interrogations and on-site experiments, we discovered new flaws, followed the clues, found the owner of the broken leg brooch, fixed the chain of evidence, and linked each other to find out the case within the case and capture the real culprit who fled the case. Just when the case was about to be solved, Fang Ruolan committed suicide by biting her pulse while in custody, leaving Meng Di confused. She humbly sought advice from Yu Zhennan, clarified her thoughts, deeply analyzed the criminal psychology of those involved, and figured out the complex emotional entanglement between the suspect and the victim and the subtle relationship between killing and being killed. She saw the extreme harmfulness of human nature from the entire case. This article demonstrates justice, promotes the power of law, and lashes out evil, and has strong practical educational significance.