A Detective Dee fan novel. Detective Dee discovers that Li Yuanfang, his formidable companion, has been replaced. How could their enemy have managed to switch him out? Dee is captured, but uses his own wits to escape and reunite with the real Li Yuanfang. Together, they uncover an evil organization called the Evil Spirits, whose members specialize in impersonating other people. They disguise themselves as Detective Dee, Di Chun, Zhang Huan, and others, making it impossible to tell the real from the fake. A series of baffling cases of mistaken identity follows.
