When Lizzy publically exposes her telekinetic abilities, she is taken from her family and placed at a special school that is supposed to teach her how to control her powers. But Lizzy is a Langdale, born from a long line of powered beings, and has had control of her powers since she was 1 year old, and instead of learning basic lessons, she might just learn the secrets of the school instead - including what "unassigned" refers to.