Roger Aykroyd was an old and wealthy squire, and the short flight around Roger and Mrs. Flals was also popular in the village for many years. But Roger knew full well that the woman he loved had poisoned her husband and gone unpunished, and he knew that the woman he loved was suffering from being blackmailed over it.
The plethora of these things exhausted the elderly Roger, and the last straw that broke him finally fell on him— Mrs. Flas was overwhelmed and committed suicide by taking an overdose of drugs. Mrs. Flass's suicide note was soon sent to Roger, and the murderer who blackmailed Mrs. Flals was about to be revealed to the world, but before Roger could finish reading it, he was killed in the study, and the key suicide note disappeared...
Author: Agatha Christie Manuscript
Just when everyone was anxious about this, a small man, a figure-bearded detective who resembled a clown in the troupe appeared. The protagonist of the story, Dr. Shepard, as Roger's personal doctor, Roger's most trusted person, naturally became the detective's assistant. Of course, becoming a detective would have been Dr. Shepard's second hobby.
Through the careful investigation and meticulous reasoning of Poirot and Dr. Shepard, the case progressed very smoothly. When everyone pointed the finger at Mr. Roger's son, Ralph Payton, but Dr. Shepard did not think so, as Ralph's good friend, Shepard tried to excuse him, and Detective Poirot seemed to see what was going on and did not rush to conclusions. The case was frozen at this point, no one knew what to do next, and everyone was like a headless fly, speculating wildly.
Mr. Roger's new tape recorder gave Poirot a new inspiration. Soon, the murderer is locked by Poirot. A man who can come and go as he pleases in roger's house without being suspected; a man who knows some mechanical common sense; a man who has a time to commit crimes. In fact, this man is — Dr. Shepard!
Roger's Mystery Case is the famous work of Agatha Christie, the queen of British detective fiction. The book's first-person doctor, Dr. Shepard, plays the role of Detective Poirot's assistant throughout the book. Our habitual thinking naturally shields the detective camp from suspicion. But it is not until the end that we find out that his true identity has been hidden, and he is the murderer! One of Knox's Ten Commandments is that a murderer is not allowed to be a detective. If the murderer is a detective, then the initiative of the case is completely in the hands of the murderer, and there cannot be a reasonable result.
However, in Grandma's hands, all the golden rules can be broken, and there is no ending that is more eye-catching than the detective being the murderer. Breaking the mold, this is the charm of detective novels.