Paul Linden (David Farrar), a wealthy and prominent architect, returns home to Marylebone, London. He brings his new wife: beautiful, French, 24-year-old Nichole (Noelle Adam), whom he has just married in Paris. Paul is anxious to introduce Nichole to his teenage daughter Jennifer (Gillian Hills), but Jennifer appears less than happy about her father's remarriage and coldly rejects Nichole's friendly overtures all evening. After Paul and Nichole go to bed, Jennifer sneaks out to the Off-Beat café in Soho for an evening of rock music and dancing with her friends, including Dave (Adam Faith), a youth from a working-class background who plays guitar and writes songs; Tony (Peter McEnery), a general's son whose mother was killed in the Blitz and who has a drinking problem (although beatniks frown on alcohol); and Dodo (Shirley Anne Field), Tony's well-bred girlfriend. Dave and Jennifer are attracted to each other.