Boring, clunky, do not recommend. This had the potential to be a great book, but the narrative was not up to the task.
The main character is Myrtle, who uses past and present to tell her story and those of the witches in her ancestry. She has an evil twin sister and the plot was supposedly about this clash of power, with spirits of the dead on both good and evil sides helping along the way. Unfortunately the majority of the book was mundane, and moments of suspense would be broken by her going home or something. For example towards the end we get the stupidly easy solution to her life long problem, but it gets interrupted just as the tension is building so that she can go home, put on a warm jumper, woolly socks, wellies, and spend time sorting out herbs and crystals for spells.
The book covers the time span from when Myrtle was born until she is retired, but major life moments, like rape, and giving her child up for adoption at birth were dealt with flippantly before bouncing into a different bit of the story. Her sister has dark magic, but neither she, her mum, or the coven, do anything useful to combat it, with most of the references to Marigold (the sister) describing her like a child with special needs who doesn't like loud sounds, or like a petulant child who can be distracted with food.
The only parts of the book with any detail are those that describe the herbs, the crystals, words, and actions used for spells. Seriously at one point something happened and then there were three pages going on about how a spell was created. Chapter 17 in particular read like a leaflet for 'why witchcraft is good', but did nothing to further the actual story.
None of the characters made me care about them, they lacked depth. By the end I was actually groaning with disappointment every time I turned a page and there was still another chapter.
The use of a grimoire with stories of her ancestors in it could have been better, and indeed I have recently read Weyward by Emilia Hart where this exact story device is not only done well but becomes an integral part of the plot. Here it does not, it comes over as a lazy way to explain the background, like when you're on the second book of a series and the first few pages try and cram all of the important points from book one into them.
The only good thing I have to say about it is that I borrowed it from the library, so I didn't waste money on it.