For complication’s sake, you can hardly do better than this one.
“Two Hours to Doom” was originally published in the U.K. with Peter Bryan George using the nom de plume “Peter Bryant.”
He reverted to Peter George when it was published in the U.S. as “Red Alert.”
Then Stanley Kubrick found the novel and began working on a screenplay with George and Terry Southern.
Originally designed to be a straight telling of the serious novel, the screenplay got out of hand, and eventually warped into the classic “Dr. Strangelove.”
Since it was now too different from the original to make it worth the while to republish it to cash in on the movie’s fame, George wrote a novelization titled “Dr. Strangelove,” making him the only author I know of to have novelized his own novel.