Four men were gambling in a hotel.Soon three of them lost their money and the man in black trousers was so angry that he killed the winner that night.Then he ran away with the winner's belongings.
    The next morning,when a hotel servant entered the winner's room she was astonished to find that her client had been killed.Soon a policeman was called.After having examined carefully on the spot,it occurred to the policeman that a former criminal whom he knew well might be the murderer.His guess was proved true after he showed the criminal's photo to another man who had been gambling with him that night.
    The search for the criminal lasted several days.Finally,the policeman caught the criminal when he was just committing another crime.