Captain Jack Archer (Jack Frank) is a young embassy official in Stockholm who has an unexpected and mysterious encounter with a strange woman named Eva (Kim Frank), who introduces him to the fascinating but inexperienced teenager Flossie (a Marie Forså with a beautiful, innocent, pubescent air), intending to gently seduce her. Jack immediately falls in love with Flossie when he meets her, and they spend much of their time together recounting their experiences, groping and having oral sex until, in a threesome, Jack manages to deflower the young woman under Eva's scrutiny.
The beautiful Marie Forså was the perfect choice to play Flossie in Mac Ahlberg's film, an erotically explicit but very elegant film that flirts with hardcore in a somewhat softer context (fellatio, cunnilingus, and some penetration without ejaculation, always outside of Forså's control). There are many flashbacks, as in the Victorian novel, showing Flossie's sexual initiation into lesbianism as a schoolgirl with her boarding school friend Ylette (Anita Ericsson).