Robert Wagner plays an American who owns a Lisbon nightclub and Teri Garr is a slightly dippy chanteuse who has stumbled across a Nazi plot to kidnap the Duke and Duchess of Windsor, living at the time (1942) in Portugal.

Former Irish Republican Army member Niall Hennessy lives in Belfast, Ireland, with his wife and daughter amid the ongoing Irish-British conflict. Though he still knows people in the IRA, including fugitive leader Tobin, Niall has given up his violent ways. One day his family is caught in a chaotic street shootout and killed by British forces. Overwhelmed with rage and hunted by a Scotland Yard inspector, Niall heads to London to exact his deadly revenge.

David Callan, secret agent, is called back to the service after his retirement, to handle the assassination of a german businessman, but Callan refuses to co-operate until he finds out why this man is marked for death.

When odd reports are received through official channels stating that the President of the United States is being held captive on a secret international moon base called Vegan and that he has been replaced on Earth by a clone, the US Marshall Service immediately sends their 'best' man, Dix, on the mission.