One summer night, in a hotel in new york, Oman, a swindler pursued by the police and his three assistants got together to discuss the fraud case of a jewelry company. This jewelry company is one of the most advanced jewelry stores in new york, and its security is very strict. It has the most advanced electronic alarm system, and employs a private detective to monitor all the counters of the store day and night through closed-circuit television. As long as there is a little trouble, you can press the button immediately and automatically close all the doors in the store. Therefore, Oman warned his men not to take off their gloves during the whole operation to prevent fingerprints from being left, and not to call their associates by their first names to prevent their identities from being exposed. We must act quickly, without a minute's delay.

At dawn the next day, Oman disguised as police officer Charlie and three assistants came to the jewelry store, found Mike, the company's private detective, and reported to him: "According to information, a group of gangsters are going to rob your company at noon 12 today. We want to capture it on the spot. " Then he pointed to the phone and said, "I want to call San Francisco and ask if there is any news." Mr. Mike, can you put me through? "

Mike agreed and did it. The police telephone exchange was connected soon. "Please answer ..." Before the words were finished, Oman took the microphone from Mike. "yes. I'm Charlie. Aha ... we're in a jewelry store. Please let us know if there is any latest news. I am in the company's monitoring center ... Oh, I see. "

When he finished, Mike asked, "Mr. Charlie, how many people are there?"

"We don't know much about it." Oman replied: "We only know when it is possible to commit a crime. But don't worry, the police surrounded the building 20 minutes ago. Once these three gangsters step into the gate, the road outside the gate will be blocked immediately. As soon as they leave the company, we will act. "

Mike gave Oman a thoughtful look and then went to the next room to make a phone call. After a while, the police arrived by bus and arrested Oman and three assistants.

Where did they leak the clue?

At this point, Oman can't help but be blindsided. He looked at his assistants viciously and shouted angrily, "Whoever betrays me will die."

"Calm down," Mike said to him. "You exposed yourself."

"Me?"

"That's right." Mike must have nodded. Explained:

"First of all, as a policeman in new york, it is against common sense to wear gloves in midsummer; Secondly, you didn't know the number of gangsters at first, and then you said it was three, which was inconsistent and exposed the flaw; When you answered the phone I dialed, you didn't tell the operator who to call, so the phone couldn't be connected. Do you understand now? " Mike has a smile on his face.

"Alas ..." The man bowed his head helplessly.