Who: Madame Drouin, the Postmistress
Why: She is sleepwalking.
Oh, I am so embarrassed! To think that all this time I was the one causing the troubles – in my sleep! Can you imagine? I had no idea I was a sleepwalker, but it does explain a great deal…all of those chores I thought I had done, I must have been doing them in other people’s houses! If you’ll excuse me, I must start writing some letters of apology.