After recently having read both of the author's two book mini series, I was sure that this was going to be a bit different too. It is.
I suppose that the best way to describe it is a book about a play. All of the narrative is in the form of a play script but the author also lets us in on things that the more observant audience member may see on set.
The story itself is well conceived and is very cleverly written ( as we would expect from Mr Horowitz). I would have loved to have seen the full stage production.
Does it work as well as a book about a play, I am really not sure. As I set down these note, I still don't know what mark I am going to give it. I hope that I have decided before I start typing, tomorrow.
It is a short book but it gets over some of my complaints about short books as I had no problem at all picturing the actors on the described stage and it certainly creates an atmosphere.
My advice would be to follow your instinct. If you like the authors work then go ahead. Don't read any other reviews , they may give something away that will spoil it for you.