To Daya Wijesinghe, a bruise is a mixture of comfort and control. Since her parents died in an accident she survived, bruises have become a way to keep her pain on the surface of her skin so she doesn't need to deal with the ache deep in her heart.

So when chance and circumstances bring her to a roller derby bout, Daya is hooked. Yes, the rules are confusing and the sport seems to require the kind of teamwork and human interaction Daya generally avoids. But the opportunities to bruise are countless, and Daya realizes that if she's going to keep her emotional pain at bay, she'll need all the opportunities she can get.

The deeper Daya immerses herself into the world of roller derby, though, the more she realizes it's not the simple physical pain-fest she was hoping for. Her rough-and-tumble teammates and their fans push her limits in ways she never imagined, bringing Daya to big truths about love, loss, strength, and healing.