For Ava Greene, life couldn't be more normal living in her small town of Noblesville, Indiana. Sure, it's stressful, but it has its perks: she's captain of her swim team and has a loving boyfriend who adores her.

But something odd is happening. Something Ava can't explain. Her features seem to have changed and her capabilities during the big championship race are beyond her comprehension.

Suddenly, Ava is faced with a decision: leave the only home she has ever known, along with her first love, or face certain death.