Lt. Doyle: Lars Thorwald... is no more a murderer than I am.
Jeff: [stunned] You mean that you can explain everything strange that has been going on over there, and is still going on?
Lt. Doyle: No, and neither can you. That's a secret private world your looking into out there. People do a lot of things in private they couldn't possibly explain in public.
Lisa: Like killing their wives?
Lt. Doyle: Get that idea out of your head. It will only lead you in the wrong direction.