Apologies for the Threadomancy... in the UK this movie is now on Netflix. Just watched it. Actually I thought it was rather good. Well made, lots of evocative gothic smoggy gloom counterbalanced by the gaudy yet grim interior of the music hall, and some very nice performances all round. A few good twists too. I don’t remember much about the book - I read it when it was first published, long long ago, but I recall it being a bit dense - the movie felt a bit simpler. Not a bad thing. Anyway, if you’ve got Netflix, you can judge for yourself.