"Knife in the Water" is a 1962 Polish film directed by Roman Polanski. It tells the story of a married couple who invite a young hitchhiker to join them on a sailing trip. The film explores themes of jealousy, power dynamics, and the complexities of human relationships. Set against the backdrop of a serene lake, the narrative unfolds as tensions rise between the husband, the wife, and the hitchhiker. The film is notable for its minimal dialogue and striking cinematography, showcasing Polanski's ability to create suspense and psychological depth within a confined setting.