In Pujiang District, Shanghai in 1942, the shadow of the Japanese and puppet secret services shrouded the city like the mist of the Huangpu River. CCP agent Lu Chen sneaked into the Intelligence Section of the fake police station with the false identity of "treason and surrender to the enemy" and became a hidden blade hidden in the heart of the enemy camp. His mission is to uncover the truth about the Japanese army's secret dock - where chemical weapons raw materials capable of killing thousands of creatures are being transported day and night.
Super High School Section Chief Sasaki's hawk-like gaze, Deputy Section Chief Yamada's spies, the coercion and inducement of his former military superiors, the tragic sacrifice of his comrade Li Mo, and the farewell of his lover Su Wan, all dragged him into the vortex of strangulation by multiple forces. The residual warmth of the secret message is still in the palm of the hand, the ink on the defense map is stained with blood, the whistle on the dock contains a death signal, and the light of the interrogation room is full of tests of faith.
When the chimneys of the chemical arsenal stretch into the sky, and when the shadow of poison gas bombs approaches the front line, Lu Chen can only use his life as a chess piece, walking between lies and blades. The so-called dark blade is never a cold weapon, but a belief in splitting the darkness with blood and loyalty in the darkest moment - even if there is only one last breath left, let the waves of the Pujiang River sweep away the sins of the invaders.
