https://www.goodreads.com/series/275699-anglesey-murders
These are dreadful books from a literary perspective but the first in the series was enjoyable and I liked the main character, the police detective. The grammatical errors and spelling mistakes were irritating (he was 'cagouled' in to doing something).
The series got progressively darker and gorier stretching in to the horror genre with satanism thrown in. I could stomach that.
Book 4 has left me feeling unsettled. I shall not be reading any further. Part way through the storyline takes a pause from the fictional characters and the author jumps in as himself as an investigator in to the occult sect featured in the book - The Order of 9 Angels.
If anyone else had read the series I would appreciate their opinion. I get the impression that the author is somewhat unhinged and has written the series purely to promote his own private investigations and agenda.