Before you start, here are a few tips. To be a good detective you need the same skills as a good card-player. You must consider and examine every detail, not just the obvious ones. You have to observe every change in a person's face, everything they say, everything they do and you must always expect the unexpected. And finally, you must remember it all. In this most strange tale, you'll see a friend of mine at work. He has an astonishingly analytical mind. So, pit your own powers of analysis against his - and against mine. Can you solve the mystery of the murders in the Rue Morgue?