In 1937, Huazhou fell. Lin Gengmo, a technician at the No. 11 Arsenal, dragged his injured right leg and fled into the Beishan bandits' den. No one knew that he was carrying a miniature smart radio in his arms - a defective military product from the future. The radio station can only deeply analyze three seals per day, and if it exceeds the limit, it will overheat and expose the location. The first secret message was deciphered: The Japanese army was going to encircle Beishan. The second letter: The Mei agency planted a traitor. The third letter: The War Department is hiding a bigger conspiracy. Lin Gengmo used the arsenal's native methods to reassemble used bullet casings into deadly weapons; he used radio stations to create information gaps and instigated the Mei Agency and the Ministry of War to frame each other. The Beishan detachment went from thirty guns to a "violent bandit" that frightened the Japanese and puppets. But the radio station started to call the police frequently. The fourth warning in a single day flashes, and brother Wei Debiao is captured, the identity of the military commander Ruoheng is exposed, and the female bandit Ayiguli is distracting the pursuers alone... Every time you save one person, all positions may be exposed. Lin Gengmo had to make a choice: use the few remaining analysis times to gamble on an impossible counterattack.
