“But surely for everything you love you have to pay some price.”

“Take what you want, says God, but pay for it”

“If you are to be Hercule Poirot, you must think of everything.”

“One must have common sense, nothing is permanent, nothing endures. I have come to the conclusion that this place is run by a madman. A madman, let me tell you, can be very logical. If you are rich and logical and also mad, you can succeed for a very long time in living out your illusion. But in the end....in the end this will break up. Because, you see, it is not reasonable what happens here! That which is not reasonable must always pay the reckoning in the end.~Dr. Barron”

“Oh, I'm not afraid of death! What have I got to live for after all? I suppose you believe it's very wrong to kill a person who has injured you-even if they've taken away everything you had in the world?”

“They say all the world loves a lover—apply that saying to murder and you have an even more infallible truth.”

“You do think you know about everything," said her husband. I do," said Tuppence.”