Suspense-and-mystery books usually contained intense plots, suspense, distinct characters, and rigorous reasoning processes. It was a reading experience for readers to constantly guess, explore, and reason during the reading process. These books are usually popular with readers after publication for the following reasons: 1. Thrilling storyline: Mystery books usually involve some creepy or thrilling plots such as mysterious murders, missing cases, strange dreams, etc. These plots can attract the attention of readers and make them feel nervous and excited. 2. Tough reasoning process: Mystery books usually involve some rigorous reasoning process. The reader needs to constantly think and explore during the reading process to solve the mystery and find the truth. This reasoning process can make the reader feel excited and satisfied. 3. Unique characters: Mystery books usually involve some unique characters such as smart detectives, mysterious villains, protagonists with story backgrounds, etc. These characters can bring different reading experiences to readers and increase the fun of reading. 4. Exquisite paper and cover design: Mystery books usually need readers to constantly guess and explore during the reading process, so they need to provide some exquisite paper and cover design to attract readers 'interest. These designs could be exquisite illustrations, unique theme, attractive font, etc., which could increase the attractiveness of the book. In summary, mystery books had thrilling storylines, rigorous reasoning processes, unique characters, and exquisite paper and cover designs, so they would be welcomed by readers.