How to tell whether you've read that book before or not

1. Read the title. If it doesn't seem familiar, you may not have read the book.
2. Look at the cover. If you don't recall having seen the pictures on it, you may not have read the book.
3. Read the first page. If it seems new to you, then you may not have read the book.
4. Continue reading. If you get through the first chapter without remembering any details, you may not have read the book.
5. Read the rest of the book. If, at any point, you think, hey, I've read this before, then you can stop reading if you want. You may have possibly read the book before. But since you apparently don't really remember reading it, you might do well with a re-read