One of the keys to my enjoyment of The River Series is the consistency Michael Richan has with his characters. You won't find them suddenly doing something that will give you that pause of--"Wait! He/she wouldn't do/say that!". His characters STAY in character, and their mental growth throughout the series is a very natural progression.
In book #6, DEVIL'S THROAT, Richan gives us quite possibly his most complex storyline to date. We start out with our favorite father/son duo Roy and Steven, on a mission to save Steven's own son (Jason) from an evil they thought they left in their past. We are soon joined by two new dynamic characters, Deem and Winn. These two also have the "gift", but the area where they live is nothing like what Roy and Steven are used to..... Here is where things REALLY take off! Without spoiling the story for others, all I can say is that the ghosts and other entities in this place are far different--and more dangerous--than any other previously encountered. Once more, the blood/horror factor is ratcheted up, and several "phobias" are sure to bring some readers more than a mild discomfort.
As always, theses stories can be read as a stand-alone, but this particular tale takes off immediately after the events in book #5 (SUICIDE FOREST). In order to get the most out of DEVIL'S THROAT, I would personally recommend reading the previous 2 books in the series (EXIMERE, and SUICIDE FOREST), as there are many references to pick up on from those two, in particular. Again, just my own opinion.
I've been following this series since its beginning, and eagerly await each new installment. I'm hoping to see more of these two new characters in future installments!
Highly recommended!