Personally, I think "A Study in Scarlet" is better. Of course, the stories of Sherlock Holmes are all good to read. "A Study in Scarlet": The first part mainly introduces the case. It tells the story of Dr. Watson who returned to England after being injured on the battlefield and met him by chance. **Holmes who rents the same house. One day, Holmes received a letter from Colonel Gregson inviting him to solve a case, so he and Watson went to the murder scene on Lauriston Street, where they were in an uninhabited empty house. A body with no external injuries was found. The deceased was an American. "RACHE" was written clearly in blood on the wall at the scene. At the same time, a fallen ring, two different footprints, and several finger marks on the wall were also discovered. Afterwards, after Holmes's meticulous investigation and careful reasoning, the murderer was finally found. The second part mainly recalls some of the murderer's previous grudges and grudges with the deceased in the United States, explains the murderer's motive for the murder, and explains the murderer's crime process, making the story more complete and forming the relevant story of "A Study in Scarlet" A tragedy of love and revenge. "The Four Signs" mainly tells the story of four people who got a lot of treasures together more than ten years ago and agreed to share the treasures equally, but the protagonist of the case took them all, and then the other three people started to deal with them. The victim in this case was hunted. Holmes accepted the request of the victim's daughter and found out the truth of the matter. What happened more than ten years ago came to light, and several people got the ending they deserved. It is worth mentioning that Dr. Watson found his true love, the victim's daughter, in this story. In comparison, I prefer "A Study in Scarlet", which is more story-telling and more soul-stirring to read because it involves the entanglement of several generations. But if you want to experience the excitement, you can watch the previous part "The Final Case". In this story, Holmes and Professor Moriarty dueled and fell off a cliff together. It was just that later readers were dissatisfied with Holmes' death and personally attacked the author, so the author "resurrected" Holmes in the second part of "The Empty House". I recommend reading Agatha Christine’s detective novels. The writing style of female writers is relatively more delicate.