The series works very well because it combines the wildly supernatural, spooky, and horrific with the practical and mundane. The whole series is based on horror and pulp themes, which come thick and fast in a delightful stew of the weird and wonderful. This is all confronted by our intrepid investigators, after a good cuppa, a natter and a hearty helping of fish and chips.
The characters really make these books. Brenda is the main character and the heart of the book. With her strange anatomy and centuries of bad memories, she really is a great invention. The kind of person you'd love to have as an aunt or next door neighbour. Effie is a less friendly but very familiar character, a slightly prickly and disapproving old woman. Like Granny Weatherwax, but with less obvious witchiness. There is a lot of warmth for and between the characters, and as we regularly see things from their point of view it is easy to understand them, even when they are at odds, as happens in this book.
This book riffs off pulp adventure stories, especially Rider Haggard's She books. It also takes an renewed look at human-vampire relationships (something which featured in earlier installments), but with none of your poncy angst-filled, pubescent vamps. In fact at one point a character bemoans the existence of scally vampires, proving that vampirism doesn't automatically equal a sense of style, or even an appreciation of the gothic. There's also a Dreadful Flap and some time-travel shenanigans. All in all it's good fun to read.