This book really held my attention. The story jumps straight into finding a body, enticing the reader's senses with details like the coppery smell of blood. There was probably too much information about characters given in chapter one that should have held off until chapter two to keep from breaking the tension, but I can see why the information would be relevant.
I liked the British terms and Welsh names which gave it a very regionalized flavor, though I wonder if some brand names and such might have been lost on readers from other countries.
The supernatural aspect takes an original turn that skirts folklore and quickly gets interesting for those who like occult themed stories. Old folk tales and legends meet modern New Age and a dark stranger comes to town in an almost cliché manner, yet I liked the way the author drew out the mystery around Marcus for a little while. I did guess his nature, but wasn't sure for long enough to keep the intrigue going.
There were a few parts that slowed down a little, like explaining too many details about writing tasks that would only be relevant to a writer, but mostly it keeps moving at a good pace, except that the information of how Gwyn fits into Aiden's past comes a bit late. The one thing that doesn't ring true is how her involvement in the occult could be news to Aiden with their shared past.
The new age references would be mostly familiar to anyone who knows about that sort of thing in real life. There are some familiar visualisations for protection, using methods that are actually practiced in the real world. This lends believability to the more fictionalised parts of the story.
The imagery throughout is very well done. I suspected before halfway through that I would be looking for more books from this author. Then it all falls down near the end and starts to dither, going a little hokey and suddenly stops with a promise to resolve the story in the next book. This lost a star as that's a particular bugbear of mine. If you want to write a story, at least resolve each episode to some degree. This just stops like someone ripped the book in half, and after I stayed up late to find out how it ended. Now I'm being blackmailed into buying another book if I want to find out what happens and that's anathema to me. It wasn't even a cliffhanger, just an unfinished story.
Good writing, no ending. 3.5 stars.