I enjoyed the first three books in this series, but these are suffering from a lack of likable characters (solution to every situation? Either consider killing someone or just kill them) and incredibly repetitive dialogue and descriptive sections that could be solved by having a halfway decent editor read through these books before publishing to refine some of the wording choices.
Finally, the audio book version is fine, but there are so many misrponounced words that, between that and the lazy repetition in the writing, it makes me feel like nobody gave a crap across the entire process of making this novel.