12 year-old Trey Caldwell is shattered when his soldier father is killed in Afghanistan, leaving a hole in the boy's life -- and an unfinished Soap Box Derby car in the garage. A final gift from his dad, the car is a constant reminder of all that could have been. But when Trey meets Roy Gibbs, a grizzled Fire Chief devastated by the loss of his firefighter son on 9/11, a new relationship forms and old wounds finally begin to heal.