I enjoyed this book although it wasn't quite up to my expectations having been recommended it after finishing a Salmon Rushdie's 'Midnights Children'.  There was certainly plenty of suspense and interest in the story and the author's extensive research is obvious.  There are some great characters in the novel and it has a lovely ending with a twist. 

Question: Is there a lot of depth in that great hole?
Answer: author 's extensive research is obvious