A few years ago, Anthony Horowitz--the creator of the outstanding TV series Foyle's War, among other credits--wrote a Sherlock Holmes pastiche. It was, let's say, partially successful: better as a mystery than as Holmesiana.
With Moriarty, Horowitz dodges that bullet. He puts the story within Holmes's continuity, but without Holmes himself. The result is pretty good. It's not perfect: there's some clunky prose, and some of the dialog shows a bit of a tin ear for voice (surprising in a screenwriter, but there it is). However, it has an abundance of the two really important virtues for this sort of popular fiction:
- Excellent pacing.
- A genuinely surprising denouement.