Detective Notes was a detective novel by Agatha Christie. It told the story of a young detective, Matthew Lowry, who used his high IQ and creativity to investigate a murder case and finally revealed the truth through cross-reasoning with multiple clues. The protagonist of the story was a high school student named " Genius Boy." He had extremely high mathematical and logical reasoning skills, so he could always come up with unique solutions when investigating cases. During the investigation, Matthew found that the case seemed to involve many people, and each person had their own motives and purposes. Matthew used his high IQ and creativity to finally uncover the truth through cross-reasoning with multiple clues. In the process, he also encountered some difficulties and challenges, such as overcoming his own psychological barriers and cooperating with people with different personalities. In the end, Matthew successfully solved the case through his intelligence and bravery and became an excellent detective.