Indeed yes.
Imagine my surprise when reading the original books of Phantom of the Opera, or Robin Hood, or Man in the Iron Mask and how those ended. Not for the fans of Disney films, that's for sure.
Hell, check out the original novel, THE HUNCHBACK OF NOTRE DAME, by Victor Hugo. Talk about tragic endings! Almost every movie version, from the silent era on, has softened the ending by letting Esmerelda live.
Not in the original novel -- where she is ultimately betrayed by her own mother!
(Forgive the 190-year-old spoiler.
