"Impossible crimes" occurred one after another on the beach - the deceased was locked in a secret room, but the murderer disappeared without a trace. Every time a crime occurs, a magic playing card of """ and "K of Spades" is left at the scene. Shen Guanyun, the chief magician of Paramount, whose true identity is an underground party intelligence agent, uses his professional knowledge to solve mysterious cases one after another and crack down on the shocking conspiracy that Japanese spies want to launch in Shanghai.
