I haven't actually read many lesbian mysteries, but this one was better than Sleeping Bones by Katherine V. Forrest [review] and almost as good as the Aud Torvingensen books by Nicola Griffith. It's part of a series, which I didn't know when I picked it up, but figured out fairly quickly, as our lead is emotiionally traumatised, and meets people she knows, from previous events. I will say that the cover looked fantastic and had be wanting to read the book from the moment I held it (it looks better in print than it does on the screen).
There was not enough actual scene setting or recapping, though, despite all the hints, and it's probably worth reading the first book, Red Rover, first. My review of Oranges and Lemons is going to be entirely from the perspective of not having read it, though. It's probable that the frustrations I did have would have been mended by knowing more of the backstory and knowing the characters better. But books still need to stand on their own. That's going to be a central criticism throughout this review! (It was a pretty good book, it just had some issues that inspired a great deal of analysis).