Death off the Cuff

They all stare at you expectantly, like children waiting to be told a bedtime story. Who can blame them? You are, after all, Antoine Saint Germain, the great French detective. No criminal has ever been a match for you, and everybody is looking forward to a description of your brilliant deductions. There is just one small problem. One tiny detail that makes it different this time. A mere trifle, really. This time you have no idea who did it.