This started off OK - who doesn't like a good decapitation in a crime novel? - but ran out of steam halfway through, and by the end I was finding the writing and characters quite grating.
I did wonder at one point whether the author was aiming for a specific word count (never a good sign) as there is a lot of unnecessary filler material that slows the pace down and reads more like the style of a policeman giving factual evidence in court than a 'fast paced crime thriller' as it's been described. A good editor could have stripped this book back to it's core elements and produced a much better read. Chekov's gun was sadly absent in this book.
A couple of examples - if you can't see why these would be grating, maybe you'd enjoy this book?
* At one point, a couple of paragraphs are taken up with what I could basically describe as "the (character) searched for (plot point) on google". The length of time the search took and how many results it gave - hmm, don't care really.
* Other reviewers have pointed out the insistent use of time of day for every plot point (at 8.30am he did this, but 10am he was doing this, then there was this briefing for the team at 6pm etc), I'd also add the insistent use of specific addresses, description of houses and locations and descriptions of basically knocking on someone's door and them answering - these all generally take up a few paragraphs every time the main character visits somewhere new e.g to meet a certain witness and grow pretty tedious as they are used repeatedly.
* Also, every new character is basically described in the same way, gender, hair colour, clothing, that's about it. Nothing distinguishing or memorable really, and by the end I'd forgotten or didn't really care who was who. He was an older man with greying hair wearing brown trousers and a cream shirt while she was blonde-haired woman in her thirties wearing a black skirt and a white blouse with a beige cardigan. Occasionally a character might be 'on the phone' or 'eating a sandwich' when we meet them. Yawn.
* The main character also developed quite an annoying habit of reacting to anyone who didn't IMMEDIATELY do what he asked them (even if it was someone like a doctor's receptionist who didn't even know who he was) saying "It's a murder enquiry! You'll do it right now!" - like repeatedly and make him come across as a bit of a pompous prat to be honest. Also, while 'disregard for the rules' is a bit of a trope in these detective characterisations, the 'rules' that DI Dixon breaks aren't really done for the good of solving the crime, and are done in a very cack-handed way (failing to report an accident, sleeping with an officer on his team etc) that didn't make him come across well at all.
I did really want to like these books as I'm familiar with the area they are set in, but this was quite disappointing really. There are many many better books in this genre.