At the end of the Second World War, four of the world's most powerful leaders come together and decide to make war a thing of the past. Rex Dawson, an RAF pilot, is transferred to America with his beloved wife, Sue. Rex has an uneasy feeling that something awful is going to happen to him. Instead, he discovers that he possesses a very powerful attribute that will change the course of his life forever. An anti-war organisation known as Ultra chooses him to be their next UN One, to try to restore peace in the world. Rex is confronted with grief, fear and elation as he embarks on a number of gruelling and hazardous missions for Ultra. There is insurmountable pressure on him to restore peace in the world, but will he succeed?