Danilo Stojkovic portrays a character who is intensely loyal to Stalinist ideals and strongly opposed to capitalism; he’s presented as someone patriotic but also filled with suspicion. The story unfolds when a businessman, having spent time in France, comes back home and leases a property. Believing this man to be an agent of capitalist interests attempting to undermine Yugoslavia, Danilo starts observing him. He relentlessly tracks the individual around the clock, experiencing various odd occurrences along the way, but maintains his surveillance... and that's when things start to become noteworthy!

Source on TMDB