Originally Posted by s-island
My book never said anything like that on the back! I checked out the movie versions and it looks like only the Russian one from the 1980s kept the original ending. Sucks...
Dama Agatha adapted the book into a play, in which she changed the ending to
Wargrave revealing himself before Evra Claythorne commits suicide; at that point, Lombard, having survived Evra's shot ("Woman can't aim straight enough" apparently), kills Wargrave; I think they both then hang themselves, or get married. I can't remember. There's a lot more dialogue in the play
So maybe the films used her ending. Although some films just changed the setting and kept the story intact.