Mr. Liu, the vice captain, and Mr. Zhao, the commissioner, meet to discuss a case. The vice captain says that they received information that an enemy spy was going to hide confidential information in a locker in number 5 of the company. However, they did not find anything in the locker that morning. They also received a secret letter that was hidden in the gold bar. The commissioner says that the letter must have been stolen, and that the culprit must have manipulated the information. He asks the adjutant if he knows anything about the case, and the man says that he does not. He says that a servant told him that he walked out of his sister's room a few days before. The man asks the commissioner what he wants to say, and he says that it is a big crime to lose the letter, but that he has to think about it before making a decision.