I found this in a charity shop, not realising that Victoria Schwab wrote children's as well as adult books. But no one is ever too old to read a children's book, and this one is excellent. Cass is a likeable narrator, and her quirky parents are great characters. The basic premise that she can travel to the between world of ghosts is interesting and well carried through, and when the real and shadow worlds intertwine it is positively scary. An enjoyable fun read.