Following the cover up of a crash of a nuclear bomber at an American Air Force base in the UK, Dennis Markham (Ian Bannen), a prominent Member of Parliament and opponent of the American nuclear presence in the United Kingdom, is planning to ask questions about it in Parliament. Before he can, he is reported by a London paper to have been seen leaving a woman's home on the same evening as she is visited by a military attache from East Germany, Markham's loyalty to his country is questioned. He is hounded by the media and is forced to resign.