There were many reasons why a novel that he had read before could not be found now. The following are some possible reasons: 1. copyright protection: Some novels are protected for a period of time after publication to prevent unauthorized reprinting and use. If he missed this period, the book might already be under copyright protection and could not be obtained and used legally. [2. Web delete: Books can be easily found on the Internet.] However, if the content of the book was deemed inappropriate or deleted, the book might not be found on the Internet. This could be due to the government, websites, or individuals 'actions. Storage problem: If you have saved the novel on an unsafe or unreliable device, the device may be lost or damaged, making the novel impossible to find. In addition, if the novel was downloaded to a mobile device and then deleted, the novel might not be found. Forgetting: Sometimes we might accidentally forget the novel or put it aside and no longer pay attention to it. This might cause us to miss the release date of the novel or other relevant information. 5. Number of reads: If you have read a lot of novels, then there may be many novels scattered in different books, making it difficult to remember which novels you have read. These are some of the reasons why novels that you have read before may not be found now. If you want to find the novel you have read, you can try using online search tools or try to find it in the trash bin or file manager.