Well, first of all I have to confess that I have bought this book while it was free on Amazon.
I am glad that I did not pay for it. Don't get me wrong. It's not that I did not like what I read. The problem is that in my opinion The Dead Room is not a full novel. I do not accept it. It is not finished. Most of the times, when the book has a sequel, it has it's own finish and it implies that even so, that is not the end of the story.

Here, they have just divided the book at some point and decided that the readers would have to pay again to get to some kind of end.