水の中のナイフ

Knife in the Water (Polish: Nóż w wodzie) is a 1962 Polish psychological thriller film co-written and directed by Roman Polanski in his feature debut, and starring Leon Niemczyk, Jolanta Umecka, and Zygmunt Malanowicz. Its plot follows a husband and wife who are accompanied on a boating trip by a young male hitchhiker, who spurs a number of escalating confrontations between the couple. The film was nominated for Academy Award for Best Foreign Language Film and is Polanski's only Polish-language feature to date. Knife in the Water has garnered acclaim from film critics since its release, and is one of Polanski's best-reviewed works.

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