LOS ANGELES, March 14 (UPI) -- Screenwriter David Koepp turned a movie idea into his first novel, Cold Storage , which is now a film available on digital video-on-demand. Koepp adapted his own book. In a recent Zoom interview with UPI, Koepp, 62, explained how Cold Storage began as a pitch for a movie. "After two or three pages, I thought there's no reason this has to be [expletive] prose," Koepp said. "Let's try and make it decent prose. Then it just became this different kind of storytelling