In 1942, Chinese Expeditionary Force suffered heavy casualties in their effort to expel the Japanese from Burma. A year later, when their intel showed the Japanese was developing a type of poison gas that will change the outcome of the battle, they sent a small specialized squad to stop the Japanese plot. To accomplish the mission, the team must cross over the raging Nujiang river, overcome the harsh landscape of Yeren Mountain, and infiltrate the Japanese camp without detection.