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.
—Bill Koenig