​Psycho (1960)
Summary: A Phoenix secretary embezzles $40,000 from her employer's client, goes on the run and checks into a remote motel run by a young man under the domination of his mother.
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Bloch: “Many times I’ve been asked whether or not I would have liked the opportunity to do my own adaptation of the novel. Perhaps I could have added a few touches; I most definitely would have fought for a final explanatory scene only half the length of the one used in the picture. But the blunt truth is that it’s just as well for me—and the film—that I wasn’t asked. Without any previous experience, I doubt I had the ability to have done a satisfactory screenplay, and at the time the thought never crossed my mind.”
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Category: Motion Picture
Script: Screenplay by Joseph Stefano adapted from Bloch’s novel Psycho.
IMDB page: Psycho

Notes:
  • Bloch did not write the screenplay to any other subsequent film in the Psycho series. For these, as well as the Bates Motel television series (2013-2017), the author receives variations on the “based on characters created by” credit.
  • In 1998, director Gus Van Sant released an almost shot-for-shot color version of the Hitchcock film, starring Vince Vaughn in the role of Norman and Anne Heche as Marion. The writing credits here are same as listed above (Stefano, based on Bloch).
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  • Read about the three locations the "Psycho House" was located: Psycho House.