I recommend the following classic mystery novels to you: " Detective Pikachu ": This is a mix of a mystery novel and a Pokemon. It has strong childhood memories and nostalgia. It's especially suitable for friends who love mystery and elves. " Higashino Keigo's White Night Walk ": This was a very popular detective novel. The hidden darkness of human nature and the reasoning logic were classic, and it was loved by countless readers. " Gorgeous Challenge ": Although the main content of this novel is about love and motivation, there are many hidden elements of reasoning. The logic and layout are excellent, and it's full of fun. It's a classic book worth reading. I hope my recommendation can help you. If you like it, remember to tell me.