Have you thought about what might have happened if American President Kennedy was saved in 1963? Impossible, you will say, Kennedy was killed in Dallas, Texas, on 22nd November, 1963, and that' s an end to it. But what would happen if he came back to life? That' s what the stuff books are made of. In 1988, an American named George Bernau wrote a book of this kind. The book is called "Promises to Keep". It was thought of as the best one of this kind. He made the book like real life. The story was so interesting that it kept readers turning the page till the end though it had over 800 pages. In fact we know that John F.Kennedy was killed and never came back to life. In this book, he comes back to life, and the story begins from there. The book set readers thinking, not especially about Kennedy' s killing, but about what would happen after it.