Starting from the fourth book and now in this fifth (also the final book) the scary level somehow not as gripping as the series first three books, especially the third one which in my opinion was the most scariest of all. However I must admit Lockwood & Co is one of the best series that I ever read. I really enjoy how all protagonist characters developed from mostly annoying into a solid amazing skilled team through out the stories (especially the ghost who trapped in a skull who very fonds to make a lot of sarcasm comments). I think The Empty Grave did not conclude the series completely because some unfinished matter left by only suggestion hints for answers. Can't tell more without spilling the bean, all I can say is if you want some horror reads yet very enjoyable (and very hillarious) then this series is a must.