[1] The series follows a girl named Cara, whose grandmother gives her an amulet that allows her to pass through into Luster, the land of the unicorns.

Cara Diana Hunter and her grandmother, Ivy Morris, realize they are being followed on their way home from the library.

Ivy gives Cara her special amulet and instructs her to run to the top of the church tower.

Cara does this, and ends up in a magical forest in a different world called Luster, the home of the unicorns.

Cara makes several friends on her way to find the Old One, who is actually the Queen of the unicorns, in order to deliver her grandmother's message.