凡是经过，皆有痕迹。刑事技术警察崔寻走过半个多世纪，与同事屡破大案，这位秉承着“为人民服务”初心的神探，不仅见证了公安事业的发展，更见证了新中国的崛起。

The film follows criminal police officer Cui Xun over half a century of investigative work. Alongside his colleagues, he solved numerous major cases while staying true to his original aspiration of 'serving the people.' This legendary detective not only witnessed the evolution of China's public security system but also stood as a living testament to the rise of New China.