Quite enjoyed this one. The pace is easy to read and makes it hard to put down and the story definitely keeps you coming back to see what happens, even though you sort of already know. I did find the difference between what I know of the 'downstairs' and what was written here a bit odd - but as the author noted in the book, this was in the US, not Britain.
All in all a very interesting read, with a satisfying end. I look forward to reading more by this author.