Xiao Shenyang plays a policeman on vacation who stays at the "Wuzhixiang" B&B. Other guests staying at the B&B include the detective novelist Mengzhu played by Qin Hailu, the homeless man played by Dong Chang, and the pianist played by Cao Enqi. As the B&B owner and the waitress both died, the identities of all the people in the B&B became confusing. All of them were suspects and detectives. The "Wuzhixiang B&B" was filled with mystery overnight. What unknown secrets are hidden behind each person? Are their identities really as simple as they seem? While everyone tries their best to clear their suspicion, will they become cannon fodder for others?