Bests & Worsts Reviews from Amazon

I wish I had known before I read this book that the main plot goes on ad infinitum. While this book is fairly good, the murder that is solved seems almost peripheral. The two overriding storylines are left without any progress. I have read all three of the books in this series that have been released so far and I'm done. I don't feel like the under solved in each book is enough to be able to call these stand-alone. The progress on the main mysteries (who killed Tyler, why the blackmail type threats to Sam) have negligible progress. Who knows how long this will be dragged out, so I'm quitting now.