[ If McGillis is unsettled by any of Moriarty's behaviour, there is no indication of such. He's dealt with all kinds of unsavory types in his life and a little unexpected behaviour doesn't faze him. Moriarty will simply get the impression that he's being studied in turn. ]

One of our anonymous letter writers seems to feel very strongly about whatever change you have hidden from us, yes. One might go so far as call it threatening, even without an actual threat present.

You wouldn't happen to have a good explanation as to why you did that?