The Mysterious Mr. Quin: A Short Story Collection - Harry Stephen Keeler

The inimitable Agatha Christie intrigues, surprises, and delights with The Mysterious Mr. Quin-a riveting collection of short stories centered around the enigmatic Harley Quin, whose unpredictable comings and goings are usually a good indication that something is about to happen.and rarely for the best.
It had been a typical New Year's Eve party. But as midnight approaches, Mr. Satterthwaite-a keen observer of human nature-senses that the real drama of the evening is yet to unfold. And so it proves when a mysterious stranger knocks on the door. Who is this Mr. Quin?
Mr. Satterthwaite's new friend is an enigma. He seems to appear and disappear almost like a trick of the light. In fact, the only consistent thing about him is that his presence is always an omen-sometimes good, but sometimes deadly. . . .