The film tells the story of Nina (Portman), a professional ballerina who lands her first lead role in her company's latest production, Swan Lake. As Nina struggles to meet the demands of her dual character as both the Swan Queen and the Black Swan, her relationship with her mother (Barbara Hershey), her director (Vincent Cassel) and fellow dancer Lily (Mila Kunis) all become increasingly complex whilst her mental state becomes less and less stable.
Whilst praise has already been heaped upon Portman and Aronofsky, it's important not to overlook the importance of the supporting cast in making the film the success that it is. Cassel brings both intensity and intrigue to his role; Hershey too is strong as the strict yet devoted mother to Nina, and deserves high praise in particular for her scenes with Portman when Nina falls further into mental instability. The character of Lily is potentially the most demanding after Nina herself, but Kunis handles the role incredibly well, striking a balance between the different elements to her character, at times cerebral, at others much more physical.
The triumph here, however, must be a shared achievement of Portman and Aronofsky. Portman's performance is blissfully enigmatic, allowing the audience to develop an uneasy relationship of sympathy and distance with Nina in a very short space of time which lasts until the very last shot. It's a turn more than worthy of her Best Actress Oscar.
Portman's performance fits seamlessly with Aronofsky's direction, a heady fusion of extreme realism and the disturbingly surreal blurring the lines between the real world and Nina's warped perspective. This intentional ambiguity creates superb psychological melodrama with occasional hints of horror, and makes Black Swan Aronofsky's most finely crafted film to date. In fact, if there is one criticism of the film it's that it is at a few points almost too uncomfortable to watch. Black Swan, fundamentally, is a film I find it very difficult to fault. Whilst it may at times be a difficult viewing experience, this is undoubtedly an incredible piece of cinema.