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.
You can now watch Knife in the Water online on the following streaming providers in the United States.
| Writing | Roman Polanski | Screenplay |
| Camera | Jerzy Lipman | Director of Photography |
| Writing | Jakub Goldberg | Screenplay |
| Sound | Krzysztof Komeda | Original Music Composer |
| Writing | Jerzy Skolimowski | Dialogue |
| Writing | Jerzy Skolimowski | Screenplay |
| Editing | Halina Prugar-Ketling | Editor |
| Directing | Roman Polanski | Director |
| Art | Bolesław Kamykowski | Production Design |
| Costume & Make-Up | Zdzislaw Papierz | Makeup Artist |
| Camera | Andrzej Gronau | Camera Operator |
| Editing | Maria Karpowicz | Assistant Editor |
| Sound | Halina Paszkowska | Sound Designer |
| Directing | Jakub Goldberg | Assistant Director |
| Directing | Andrzej Kostenko | Assistant Director |
| Directing | Maria Pietrzak | Assistant Director |
| Camera | Jerzy Szurowski | Assistant Camera |
| Camera | Julian Magda | Assistant Camera |
| Camera | Józef Nasiadka | Assistant Camera |
| Writing | Agnieszka Osiecka | Lyricist |
| Sound | Jerzy Szawłowski | Sound Assistant |
| Production | Stanisław Zylewicz | Production Manager |
| Production | Jerzy Laskowski | Assistant Production Manager |
