Try looking on Archive.org. They have a collection of various digital content, including some novels. However, the availability of the specific novel you want might not be guaranteed. Also, check out some public library websites that offer digital lending services. They might have it in their collection.
You could search on Project Gutenberg. But keep in mind that not all novels are available there for free and the selection might be limited. Another option is to look for fan-made websites dedicated to sharing novels, but be cautious as the legality of such sites can be questionable.