Poirot," I said. "I have been thinking." "An admirable exercise my friend. Continue it.
Peril at End HouseYes, I am a prisoner of sorts, but my prison isn't the house. It's my own thoughts that lock me up!
Pearl in the MistI wish you'd help me look into a more interesting problem - namely, my sanity.
Welcome to the Monkey HouseI don't know. I got nothing. No house, no people, no place. Maybe that's troubles. Don't I say?
A Walk in the Night and Other Stories