In the autumn of 1938, the Japanese invaders were directly targeting Jiangcheng. This huge port on the thoroughfare of nine provinces was shrouded in gunpowder smoke and undercurrents. Lu Jinghang, a business manager who returned from studying abroad, appears to be the handsome Shaodong of Litong Yangxing Company, but secretly he is the ace agent of Jiangcheng Station of the Military Command, codenamed "Gecko". During a late-night meeting, intelligence agent Lao Mao died. Before his death, he left a top-secret codeword on a blood-stained film - "Lion Forest". Hidden in the film is the Japanese army's precise plan to attack Jiangcheng, as well as a poison gas deployment map. However, there is something lurking inside the military command station, and the Japanese are pressing closer. Lu Jinghang must uncover the lurking spy leader "Scorpion" in the dangerous city where the enemy is indistinguishable from friend to foe within seventy-two hours, and try to send out the deadly information. He single-handedly went deep into the Japanese Concession, and started a tit-for-tat game with Yuichi Miyamoto, the head of the Meiji Agency. He also teamed up with the telecommunications wizard Su Manyun to decipher the death code among the ruins. When the dawn attack artillery fire tore through the sky, Lu Jinghang discovered that the real murderous intention had already penetrated around him - the death scene in the Lion Forest had just begun. The lonely bravery of the agents, the fall and resistance of the city, all reverberate between hidden guns and secret electricity.
