After the Songhu Battle, Shanghai fell and the French Concession became an island among islands. Shen Yixin appears to be the translator of the Concession Patrol Room, but is actually an underground intelligence agent of the CCP, codenamed "Chaosheng". He received a top-secret mission: to protect a piece of intelligence that could turn the tide of the war in East China - a record of secret conversations between senior Japanese and puppet officials and German military advisers. The enemy has laid a dragnet, and patriots disappear in dark alleys every night. On the night when Shen Yixin got the information, he discovered that the traitor who betrayed his comrades was actually the most unlikely person...
