Milos, a retired porn star struggling to provide for his family in Serbia, is presented with an offer he can't refuse: a lead role in an "art film" that promises to solve his financial woes forever. Lured by the promise of substantial payment and anonymity, Milos agrees to the project. However, the film's director unveils a series of increasingly bizarre and disturbing scenes, leaving Milos reeling and questioning the true nature of his work. He finds himself trapped in a nightmare scenario where the boundaries of reality blur, and the safety of his family hangs precariously in the balance. "A Serbian Film" earns a place, albeit a controversial one, on a "Best Mystery Movies" list because of its slow-burn unraveling of a horrific conspiracy. The film deliberately shrouds the true nature of the project in secrecy, forcing the viewer to piece together clues alongside Milos as he descends into a horrifying rabbit hole. The mystery lies not only in the director's motives and the film's ultimate purpose, but also in the extent to which Milos is culpable and whether he can ever truly escape the depravity that surrounds him. The film relies on the shock value to keep viewers guessing until the very end.