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Little Marty was hit by a car and killed, and the perpetrator fled. Marty's father, Frank, was heartbroken. He went to the scene to investigate alone and identified George as the primary suspect. He decided to take revenge. After Marty's death, Frank kept a diary every day. He wrote down his investigation of the car accident, his hatred for the perpetrator, and his plan for revenge. Finally, the day came to implement the plan. Frank's plan failed, but George still died. What's worse is that because of that diary, all suspicions are pointed at Frank. In order to remove the suspicion, Frank turned to Nigel Strangeways for help, so the famous detective came to the scene of the crime...