An exhilarating thriller set against a 250-mile foot race in the Sahara Desert, where at least one ultramarathoner is running for her life Adrienne Wendell was once an exceptional ultramarathoner, a runner whose times were within striking distance of setting records. Years ago, she gave it all up when her son Ethan was hit by a car while she was in a race and unable to come to his help. He survived, but it horrified her that she had...