How does And Then There Were None, by Agatha Christie end?

In English we are reading that book, and i read way ahead, but my last two pages ahead ar ripped out!!! So, i don't really know who the killer is! Last year i read the play version, and i think it was Wargrave who was the killer. But, the book is different. It ends with Vera hanging herself. So, what i want to know, who is the killer for the book version? And, is Wargrave the killer in the play version? Please help, thanks! (: