Stanley Kubrick never threw anything away. On the other hand, he didn't have much of a filing system, and when he moved--permanently, it turned out--from Hollywood to London in 1962, a great many things went astray. Among them was the sole copy of a film treatment called "Lunatic at Large," which Mr. Kubrick had commissioned in the late '50s from the noir pulp novelist Jim Thompson. The manuscript remained lost until after Mr. Kubrick's death, in 1999, when his son-in-law, Philip Hobbs, working with an archivist, turned it up, along with a couple of other scripts, and set about trying to make it into a movie. Charles McGrath reports.