What detail does Poirot notice after the Countess leaves?

What detail does Poirot notice after the Countess leaves?

Asked by Lanissa on 28 Feb 18:22

Last updated by Jill W on 28 Feb 20:06

Answered by Jill W on 28 Feb 20:01

Poirot notices "a grease spot on a Hungarian diplomatic passport."

Murder on the Orient Express, Part II, Chapter 7