From the back cover:
Air, Earth, Fire, Wood, Water - the cornerstone of an abominable plot to control the world's chi. To stop it, our heroes must wage a kung-fu campaign across time, from modern-day Hong Kong to 1850s Canada to 2056 Containment Site DS4S. The missiles-flying, choppers-exploding, bullet-riddled climax brings them to Three Gorges Dam, a colossal structure that will divert the flow of the hallowed Yiangtze River.
Can your players stop the nefarious plot of the Four Bastards?