The play is a tribute theme, telling a spy war legend before the Changsha Battle, which was full of dangers but not without passion and faith, and paying tribute to the unknown heroes. It aims to convey the Chinese spirit and promote Chinese strength. During the Anti-Japanese War, the patriotic youths Yun Hongshen and Wen Yeming set up a trap in the fog of doubts and suspicions of good and evil, put aside their family feuds in the face of national hatred, set themselves up as dead chess pieces, and dug out the Japanese agent "Black Butler" lurking in the national army, turning the situation in Changsha around.