In the early spring of 1941, the city of Hangzhou was filled with fog. The CCP's underground traffic officer "Flamingo" died mysteriously during a meeting at Qingtai Hotel. The radio parts he was carrying and a piece of top-secret information about the Japanese army's upcoming "clearance of the countryside" disappeared. Chen Muzhi, leader of the Hangzhou Special Situation Team, was ordered to conduct a thorough investigation. On the surface, he is the accountant of Qingtai Hotel, a cowardly and philistine middle-aged man. He must find the mole among all kinds of guests in the hotel within 24 hours.
