Lou Montgomery has the voice of an angel, or so her mother tells her and anyone else who will listen. But Lou can only hear the fear in her own voice. She's never liked crowds or loud noises or even high fives; in fact, she's terrified of them, which makes her pretty sure there's something wrong with her.

When Lou crashes their pickup on a dark and snowy road, child services separate the mother-daughter duo. Now she has to start all over again at a fancy private school far away from anything she's ever known. With help from an outgoing new friend, her aunt and uncle, and the school counselor, she begins to see things differently. A sensory processing disorder isn't something to be ashamed of, and music might just be the thing that saves Lou--and maybe her mom, too.