The secret agent Harry Tasker (Arnold Schwarzenegger) has been happily married with his wife, the legal secretary Helen (Jamie Lee Curtis), for many years living in the suburbs and having a teenager daughter, Dana. Helen does not suspect that Harry has a double life, and she believes he is a computer salesman. After a top-secret mission, Harry finds evidences that Helen is having an affair with Simon (Bill Paxton) , a used cars salesman that seduced Helen with the glamour and excitement of his fake life, telling her that he is a spy. Harry forces his partner Albert Gibson to use the resources of their agency to follow Simon and Helen; they abduct Helen wearing masks and later they assign a pseudo mission for her. However, a group of terrorists kidnap Helen and Harry and the couple gets involved with a dangerous group that possesses an atomic bomb ready to be exploded in Florida.