Mercenary Frank Martin has accepted a job that seems easy enough, as chauffeur and bodyguard to young Jack, son of crusading politician Jefferson Billings . The problem is that Billings is crusading against an international drug cartel. They retaliate by kidnapping Jack and infecting him with a deadly and highly contagious virus. Responsible for the boy, Frank must reclaim him and then find an antidote before scores of innocents are stricken.