- Doctor: [Last lines] His throat was torn exactly like the Marco case.
- Inspector Wilson: [Asking about the connection between the deaths] What's the connection?
- Doctor: What connection could there be? Witchcraft?
- Inspector Wilson: Hardly. Not in this day and age... not in this day and age.
- Dr. Christopher Maitland: You're a coward.
- Sir Matthew Phillips: Perhaps sometimes it's better to be.
- Sir Matthew Phillips: [to Maitland] All I can say to you is keep away from the skull of the Marquis de Sade!
- Dr. Christopher Maitland: Of course I'd like to have it in my collection provided it's genuine.
- Sir Matthew Phillips: It's genuine enough.
- Dr. Christopher Maitland: How could you possibly know that?
- Sir Matthew Phillips: Because, my dear fellow, it was stolen from me.
- Sir Matthew Phillips: I'm glad that the skull has been stolen and I advise you to leave it alone.
- Dr. Christopher Maitland: Why?
- Sir Matthew Phillips: Because it's dangerous.
- Sir Matthew Phillips: De Sade said he wasn't mad. And I believe him. He was far worse than mad. He was possessed, possessed by an evil spirit, a spirit which still inhibits the skull.
- Anthony Marco: Dr Londe could not explain his actions to the police. To all their questions, he just answered: the skull.
- Dr. Christopher Maitland: This is the first time I've ever known you to lower your price: now I know it's a fake!