Here is what I recommend, keep in mind some of them are for adults, so you will need to check if theybare appropriate:

• Junji Ito Frankenstein
• Gankutsuou (The Count of Monte Cristo)
• Legend of the Galactic Heroes
• Junji Ito No Longer Human (18+)
• Lovecraft’s Manga Adaptations (Start with At The Mountains of Madness)
• Pride and Prejudice | Jane Austen Manga
• Les Misérables Manga

There is more, just look for novels adapted into manga.

Also note that some are for adults, so you would need to check them.