故事发生在军阀割据的二十世纪二十年代。为了破获首富郭老爷家丢失的古籍《二十四孝》的案子，江南某县城警察局警探陈九斤联合郭家大公子郭盖、线人万小宝等人，抽丝剥茧，循着《二十四孝》的线索，寻找到当年受嘉奖的二十四位孝子后人，积齐二十四块孝子牌后，终于找到了郭居敬等人所藏、用于弘扬中华孝道之宝藏。故事以寻宝人的亲情、爱情为主线，穿插《二十四孝》原文故事，配合二十四位孝子后人的人生际遇来警示世人，阐释了孝乃立人之本这个道理。

The story takes place in the 1920s, during the years of the warlords. In order to solve the case of an ancient book, the The Twenty-four Filial Exemplars, which was lost in the home of the richest man, Lord Guo, Chen Jiujin of a county police station in the south of the Yangtze River, together with Guo Gai, the eldest son of the Guo family, and informant Wan Xiaobao and others, The Silkworm followed the clues of the The Twenty-four Filial Exemplars, after finding the twenty-four filial descendants who were honored that year, and accumulating twenty-four filial plaques, I finally found the treasure hidden by Guo Jujing and others to promote Chinese filial piety. The story takes treasure hunters'love and affection as its main thread, interspersed with the original story of twenty, and combined with the life experiences of twenty-four filial sons to warn the world, explaining the truth that filial piety is the foundation of a person.