This was the most engrossing creepy wish fulfillment fantasy I've read in a while. Gypsum is the one untalented sibling in a family of people capable of magic. There's no magical boarding school and kids do to each other the nasty things that kids do to each other, but even more so. It's the story of her finding her power and trying to find herself, the usual YA stuff, but I found it hard to put down and gorged on it in only a few days.