 James P. Cavanagh (qv) was the first writer to adapt  Robert Bloch (qv)s novel for the production. However, his script  was jettisoned in favor of the Joseph Stefano (I) (qv) adaptation.  Cavanagh also wrote at least five episodes of  _"Alfred Hitchcock Presents" (1955)_ (qv), including two directed by  Hitchcock.