On their way to an afternoon on the lake, husband and wife Andrzej and Krystyna nearly run over a young hitchhiker. Inviting the young man onto the boat with them, Andrzej begins to subtly torment him; the hitchhiker responds by making overtures toward Krystyna. When the hitchhiker is accidentally knocked overboard, the husband's panic results in unexpected consequences.
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Knife in the Water (1962) is a drama, thriller movie running 1h 34m. Starring Leon Niemczyk, Jolanta Umecka, Zygmunt Malanowicz. Rated 7.3/10 on TMDB. Watch it online free on ZapFlix.