Violet Thyme, Sunny O'Claire, and Jade Albright attend Oakville Academy, a school that is divided between lights and darks. This isn't based on skin color, hair color, or any physical feature. This is based on how they reacted to a test a long time ago.
But when the new girl, Shadow Hayes, shows up, the three girls begin to suspect that she isn't a normal girl. Rebellious darks start attending the light's classes, and the school's sides begin fighting. Violet and her friends must figure out why the school was divided and how to stop the fight from happening, before it turns into a full out war.