"There is always something about conscious tact that is very irritating."

"How convenient if you could ring up Harrods and say ‘Please send along two good murderers, will you?’"

"But when investing money, keep, I beg of you, Hastings, strictly to the conservative."

"They are so busy knocking that they do not notice that the door is open!"

"What beats me — it always does — is how a man can be so clever and yet be such a perfect fool."

"I have given them life instead of death, freedom instead of the cords of superstition, beauty and truth instead of co…"

"Oh dear, I never realized what a terrible lot of explaining one has to do in a murder!"

"I specialize in murders of quiet, domestic interest."

"The intense interest aroused in the public by what was known at the time as “The Styles Case” has now somewhat subsid…"

"The crime is now logical and reasonable."