 Sam Laker is an American industrialist, working in Britain, who has just been awarded an international award for industrial design. He is planning to travel to East Germany to attend a trade show and show off his invention, taking his 10 year old son with him for a holiday. Meanwhile a British Intelligence officer who served with Laker in the Second World War decides to use the opportunity of Laker s trip and his lack of an intelligence profile to coerce him into carrying out an assassination.