I love Hitchcock and this film, and i'd never heard this before: "Hitchcock made the film in complete secrecy. He optioned Robert Bloch’s 1959 novel, and bought

I love Hitchcock and this film, and i'd never heard this before: "Hitchcock made the film in complete secrecy. He optioned Robert Bloch’s 1959 novel, and bought up all printed copies, to keep the plot secret."