Kennedy survives Dallas Book

Read a book many years ago hich states JFK survives Dallas but is in bad shape. He eventually recovers and having resigned decides to run again for President. The author wrote a book about Marylyn Monroe NOT dying in l962 and IT was called CANDLE IN THE WIND. I'd like to know the author's name and book. His first name was George if that was any help. Thanks.
Promises to keep by George Bernau?

There is Promises to Keep by George Bernau. The names are changed but its pretty clear that its about JFK. Is that the book you are asking about