After healing from knee surgery, Jessie Arnold can't wait to train for the Iditarod, but she and her dogs must work hard to qualify. Jessie's practice run goes smoothly until her sled hits a bump along the trail--a dead body. What the kid was doing on a musher's trail with no sled or dogs is anyone's guess. And in a chilling moment, Jessie realizes that the case hits close to home...