A paranoid thriller of life under surveillance in Soviet Czechoslovakia. A deputy minister in the Communist Party of Czechoslovakia, Ludv?k enjoys all the luxuries that success in the party affords him, but he must be careful: he's under no illusions about the secret police bugging his apartment. Luckily, he and his wife, Anna, know where the bug is and where they can safely converse. However, any comfort they feel disappears the evening...