First Time For Everything

I've read a lot of books in my life, but I have never gotten to the very last page only to realize that the very last page had been previously removed and is now missing. Until just now. Alas.

Thankfully, despite being a Agatha Christie murder mystery, she didn't save the "Whodunnit" revelation to the very end. If you know a place online where the entire text might be, please let me know.