Mr. and Mrs. David lived with their two sons, Jack and John. One day, Mr. and Mrs. David had to go out for a wedding. They instructed both Jack and John not to open the door to strangers. They also asked them to press the red buzzer near the main door in case of any emergency. The red buzzer would alert the police van standing in the street. At midnight, the doorbell rang. John ran and opened the door, thinking that his parents were back. He did not check through the peephole on the door, before opening it. He found a stranger standing at the door. The stranger was a dacoit. He tied John and entered the house to look for valuables. The dacoit was unaware of Jack, the other brother. When Jack saw the thief, he quietly slipped towards the main door and pressed the red buzzer. Soon, the police arrived and caught the dacoit.