Since her parents split up, Ruby Reid has been having a tough time at Crestwood High. But everything changes the day Ella Mooney moves to town. Ella isn't like most teens: she's never been on a Ferris wheel, never had an ice cream cone, and sometimes she grows fangs and a tail! It's not just Ruby who takes an interest in the new girl, and the pair find themselves on the run from a mysterious group that wants to capture Ella and her whole family!