Wu River Variations1935, China. The Long March hangs by a wire. What remains of the Communist forces make a frenzied retreat to escape their Nationalist pursuers. Trudging vast distances across the nation's fractured hinterland, the only thing preventing their annihilation is the Red Army's top secret codebreaking unit. Led by Chief Zeng, the primitive listening posts and ox bone abacuses of the 2nd Bureau are the sole tools at their disposal as they sift through a