Sixteen-year-old Jessica is a runner. It's not just what she does, it's who she is. So when a tragic accident causes her to lose one of her legs, she is shattered—inside and out. Though the doctor says she'll be able to walk with a prosthetic limb, recovery is slow and full of pitfalls. Jessica wonders if the girl who died in the accident didn't get the better end of the deal. But as she struggles to reclaim her life, Jessica gets to know Rosa—a girl with cerebral palsy whom she and her friends had always overlooked. Not only does Rosa come to Jessica's rescue in math, she also helps her reach for a future that is full of unexpected opportunities. And Jessica starts to wonder: Is it possible not only to walk again, but to run?