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“Ladies and gentlemen. As you all know, I was asked to investigate what began as possible poisoning and ended in murder. And not just any murder . . .” Jean-Claude Perroquet, the celebrated amateur detective, peered around the room with one of his famous dramatic pauses. “An impossible one! “There seemed no way to explain how it was done, never mind deduce the identity of the murderer. And yet . . . I know!” Was that possible? His eyes met mine briefly as they scanned the room. Did he know? Could he really have worked out how I killed two