Has anyone read more than just the first (The Wrong Kind of Blood) Ed Loy mystery by Declan Hughes?  I read the first one three or four years ago when it first came out and while I didn't dislike it, I wasn't completely blown away by it either.  I haven't revisited Ed Loy's Dublin since the first book but apparently, someone has because Hughes has written four subsequent books!

Have you read these books?  What did you think?  Do they get progressively better or are they all about the same?