Chen Wangdao returns from his studies in Japan and takes on the task of translating the Communist Manifesto, which changes the course of his life.

The vacationing policeman stays at the "Five Incense" homestay, where there are also detective novelists, vagabonds, and a pianist played by Cao Enqi. With the death of the homestay owner and the waitress, the identities of all the people in the homestay are suddenly unclear. All are suspects, and all are detectives. The "Five Incense Homestay" is filled with mystery overnight.What unknown secrets are hidden behind everyone?Are their identities really as simple as they seem?Will everyone try their best to clear their own suspicion while becoming the cannon fodder of others?