This is going to be as short as the book is long... 
 The story's background is an incredible and powerful evocation of the Roaring Twenties in New York. The atmosphere, psychology, buildings, and cultural references are nothing less than perfect. 
 The esoteric and horror parts are pretty good too. Some scenes are downright creepy. BUT... 
 There were just too much characters, subplots and digressions for me. As soon as I was riveted by a part, I got thrown in another, and had to get into it all over again. After a while, I found my interest faltering and fading fast. 
 This is a personal feeling that does not remove the fact that this novel is brilliantly written. 
 4 stars for the style and the research.