Hou is sent by the emperor to the city of Fengtian to capture the leader of the revolutionary forces, code named Baihu, whose identity is not known, not even to his own followers. Hou meets his younger sworn brother Lei, the commander of the forces of Fengtian, whom he had not seen for years. Hou receives reports that Baihu is bringing 'Lotus Heart' from Japan to use against the Imperial government.