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A few businessmen and their wives meet up in a local hotel to have a so-called 'key party', involving sexual partner switches. The next morning, one of the men is found murdered. Van In fina... Read allA few businessmen and their wives meet up in a local hotel to have a so-called 'key party', involving sexual partner switches. The next morning, one of the men is found murdered. Van In finally makes his choice between Eva and Hannelore.A few businessmen and their wives meet up in a local hotel to have a so-called 'key party', involving sexual partner switches. The next morning, one of the men is found murdered. Van In finally makes his choice between Eva and Hannelore.