Francis McGuire is an IRA terrorist who is responsible for many deaths and acts of terrorism. He travels to America to help his cause, assumes the name Roy Devancy and is placed with Tom O'Meara, an Irish N.Y. cop. Tom and his partner, Eddie are street cops who are good at their jobs, but they don't realize that Roy is there to purchase missiles from Billy Burke an arms smuggler. Along with his friend, Sean, Roy sets out to buy and transport missiles back to his homeland, but that's before Tom finds out his true identity.