“One of us in this very room is in fact the murderer.”

“Is no one incapable of murder?”

“A murderer is seldom content with one crime.”

“It often seems to me that's all detective work is, wiping out your false starts and beginning again.""Yes, it is very true, that. And it is just what some people will not do. They conceive a certain theory, and everything has to fit into that theory. If one little fact will not fit it, they throw it aside. But it is always the facts that will not fit in that are significant.”

“What I feel is that if one has got to have a murder actually happening in one's house, one might as well enjoy it, if you know what I mean.”

“Very few of us are what we seem.”

“When you read the account of a murder - or, say, a fiction story based on murder - you usually begin with the murder itself. That's all wrong. The murder begins a long time beforehand. A murder is the culmination of a lot of different circumstances, all converging at a given moment at a given point. People are brought into it from different parts of the globe and for unforeseen reasons. [...] The murder itself is the end of the story. It's Zero Hour.”He paused.“It's Zero Hour now.”