Cross-country running is Stella Steckler's life and she won't let anything get in the way of being the best. Her sister Ellie is a talented runner too, but she has friends, goes to parties, has a life off the course. Their lives are upended when Mila Keene comes to town. The top runner on her team back home, at first they view her as a threat. But Ellie's been looking for a friend, and in a moment of weakness shares her darkest secret with Mila. Stella also connects with Mila, but finds her a distraction. When Mila goes out on a training run and doesn't return, all eyes are on the Steckler sisters.-- Adapted from jacket.