The Balkan Spy, 1982

A theatre play about an ordinary man who, after being asked a couple of questions by the secret police, becomes increasingly suspicious of his neighbour, deeply convinced that he is a spy sent to destroy the current regime in Yugoslavia. The man then engages in a series of self-conducted surveilance operations, each of which seems to prove that the neighbour really is a spy, nurturing his paranoia with each passing day. What begins as a comedy ends as a bitter tragedy of blind political paranoia and fanaticism. The play was made into a movie in 1984.