Michele, a young mathematics professor, moves into a new flat, where he becomes acquainted with his neighbors: a couple struggling with the routines of married life and an old man with a zest for living. Deeply lonely, depressed, and neurotic, Michele spends his free time spying on the people around him, especially couples. When a new French teacher named Bianca arrives at the high school, Michele finds himself falling for her... while, almost incidentally, a string of murders begins to shake the neighborhood.