Shuttlecock

Major James Prentis (Alan Bates) is a British spy of World War II and war hero who goes under the code name of "Shuttlecock". Alienated from his family and children, he ends up in a mental institution in Lisbon, Portugal, where he eventually decides to publish his memoirs 20 years after the war. His son, John (Lambert Wilson), becomes increasingly alarmed with the enigmatic Dr. Quinn (Kenneth Haigh), the director of the institution, and concludes after reading his father's memoirs that Quinn is responsible for his father's mental decline.