In 1941, there was an undercurrent in the Binjiang French Concession. Although the Japanese minions were blocked from the outside world, they used the help of gangsters to set up a treacherous killing plan. Yan Shuangying, codenamed "Sharp Sword", committed himself to the enemy camp as a lurker, but his true identity is "Abyss", our party's top lurker. Faced with the precise calculations of the Special High School and the overt and covert attacks of various factions, he wielded both wisdom and courage to deal with the demons and demons. Every time he takes action, he is not only cold and cruel, but also a refinement of his faith - in this lost city where there is no gunpowder but is full of dangers, he breaks through the siege with a solitary figure and clears the dark night with blood and fire.