That is one of my mom's favorite books! Can you please elaborate about the process of getting there/how much practice it took to get you towards the point where you could enjoy The Count of Monte Cristo in its native French?
Right now, I am studying Spanish and my reading comprehension in Spanish is low. It is not enough to understand something like 'The Little Prince' (in Spanish) to enjoy it.
One of the interesting things about Monte Cristo and actually about a lot of 19th century French literature is that there's very little archaic French in there, and I found it easier to read (though still not easy!) than many modern novels that use French street slang / argot.
If you're on iOS, the built-in dictionary app will give you Spanish->English.
https://www.amazon.com/Count-Monte-Cristo-Penguin-Classics-e...
To drive home the point of just how much I loved this book, I went on to learn French just so I could read it in the original print.
Make sure it's the full, unabridged edition (1200 or 1400 pages), though!
(Just to throw in a nonfiction title as well, Bill Bryson's A Short History of Nearly Everything is a great gift for scientifically-inclined minds (esp younger ones) looking for a first foray into the world of nonfiction, wittily-written and well-narrated.)