This is the story of a family of witches who's ancestors made a deal with a spirit of the land, and who have lived with the consequences of that for generations. Okay, so that's an overly simplified version of the story, and there's a lot more to it than that, but I'd say it's better to read it yourself and build your own understanding of it. It's well worth it.
The story sets the atmosphere right from the first few lines, and then slowly builds upon it, adding little details and opening up for more questions. The characters and the town come to life, and it's not hard to believe this is how things would go down in a small Irish town.
It's not about the town though, but about the Cleary family. There are a lot of them, and early on I wasn't quite able to tell them apart, but soon enough I got to know them better, and it wasn't an issue. In the end, it's about the family as a whole, and not any one individual - although some do stand out more to me than others (looking at you Erin).
What I really liked was the atmosphere and the relaxed pace of the story. It takes its time, meanders a bit to get a different angle on something, and doesn't rush to a conclusion. It's slow, but in a pleasant and enjoyable way. There's not much action, but there's a whole lot of atmosphere, and there's a lot of room left for the imagination to wander around and poke at things in wonder.
I don't believe there will be a sequel to this particular story, but I'd be more than happy to read another one like it.