Two good things about this book stand out. Firstly, when I was a young and impressionable ten-year-old, it ignited my interest in Welsh folklore. This was a truly remarkable experience as it opened up a whole new world of myths and legends for me. Secondly, it created in me a soft spot for snarky, awkward albino teenage characters. This particular affection is perhaps the root cause of my obsession with Dave Strider from Homestuck.
However, aside from these two aspects, this book, and indeed most of the others in the series, is rather horrible. There is a distinct lack of character development, with the characters remaining static throughout the story. Additionally, the plotting lacks logic, with events unfolding simply to resolve narrative obstacles in the quickest and most convenient way possible. The characters often suddenly speak in resonant tones and behave like adults, which feels forced and unnatural. The ever-present threat of The Dark looms, only to be conveniently dispatched on the next page, usually by some Deus ex machina that involves nonsensical rules made up on the spot. Overall, it's a rather disappointing read.