 Thieves steal an experimental form of nitrogylcerin, which is especially volatile. A guard is killed in the robbery and one of the thieves is also killed because he can t take the stress. The thieves recruit Carl Munger, an experienced truck driver who has hauled nitrogylcerin before. Munger is about to become a father and is nearly broke. Rhodes, posing as an out-of-work truck driver, wins Munger s trust and joins him in hauling the explosive chemical. All Erskine can do is follow behind and hope his partner will survive the ordeal.