What good mystery novels are there to introduce?

Hello, landlord, agatha christie's mystery novel is an excellent composition, and the protagonist in the novel, Detective Poirot, is the protagonist. Conan Doyle's detective novels featuring Sherlock Holmes are also quite famous. It's up to you to choose according to your personal preference. There are a large number of genuine books of these novels for sale in the book city. I hope I can help you.