Consider my enthusiasm for this series dampened. This was a very average effort, with a number of problems I couldn't overlook.
The biggest is the MC, Rosie. I'll give the author the benefit of the doubt and say she probably has a long-range plan for Rosie's personal growth, but if so, she's not executing it well. The MC has a chip on her shoulder about being from Essex and the stereotypes involved in being an "Essex Girl"; the chip is big enough to sit firmly in soapbox/crusader territory, as she frequently fights the good fight against the idea that an "Essex Girl" is cheap, trashy, and dumb. And then proceeds to refer to vegetarians as "nut-nuts". And utterly dismiss someone's conversation about ecology, because ... who cares? And when people fail to fawn over her best friend for being the "black urban goddess" she is, her knee-jerk reaction is to dismiss them as backward conservatives. (They were polite, mind you, they just didn't fall to their knees in awe.) Not sure how she can find the time to fight the Essex Girl stereotype when she spends so much time stereotyping everyone else.
The author also seems intent on making Rosie a bit of a dim bulb through the use of scenes and dialog that are obvious choices to highlight her ignorance without showing any desire to correct it. Again, it's hard to square this with Rosie's righteous mandate to stamp out the cliches.
She also spends a lot of time drunk. Absolutely pissed. Bottles of Prosecco at a time pissed. Now, I don't care what socio-economic class you are in or are perceived to be in by others - being a drunk is not classy. I understand some cultures enjoy the plonk more than others, but sorry, drunk is tawdry in any culture and economic class.
So. MC with contradictions. It happens, and as I say, the author might have a master plan I'm just not seeing.
Unfortunately there were some egregious editing issues too. Poor and odd word choices (she kept referring to the ground as the floor - is this a common interchange in UK English?), and poorly copyedited, this 3rd instalment felt rushed to press. The pace dragged too, and the plot was all loosey-goosey. A more severe editor would have done this book more justice.
I liked the story though, once I was able to dig through all the extraneous dead-ends. I enjoy the factual elements of historical record the author uses, tying them and local legends into her modern day murder plots. If the author dropped the hypocritical chip on the MCs shoulder, matured her up, dried her out, and tightened up her plotting, she'd have a hit series on her hands. She might yet, but this book won't be a contributing factor. I'll be taking a close look at the fourth one (if/when it comes out) before I commit to reading further in this series.