In 1920s Shanghai, heiress Lin Lan becomes a detective in the Central Police Department and teams up with forensic expert Qin Xin and a skilled investigative team. Together, they tackle extraordinary cases, forming a powerful detective duo while forging an unbreakable friendship.

Cast: Sun Yihan, Sun Meilin, Xu Hao, Rui Xiu, Li Yuan, Cao Xiyue