The court room is full for today's trial. Two young men, Simon Clark and Dan Smith, stand up. The clerk asks, 'Are you guilty of the murder of Mary Jones?' 'Not guilty!' they reply. But perhaps they are guilty. The police found the murder weapon in their stolen car, and there was blood on Simon's face. If the court finds them guilty, they will go to prison for a very long time. Can the lawyers find out the truth, by asking the right questions? Everyone in court wants to know who murdered Mary Jones, especially her mother, and her boyfriend, Jim. You can help to find the answer, too!