De wraak van 'De zwarte pijl'

Lex de Vries, a member of the scout club "The Black Arrow", is often teased by his older sister To. When she starts to insult his club, Lex leaves the house in anger and joins his friends in the club-house. The scouts decide that they will be revenged on To. They know that To is to meet her boyfriend, John Verhoeve, on a certain evening and they plan to make a film of the meeting. Some time later Mrs de Vries invites the members of "The Black Arrow" to show some of their films at a party she intends to give for family and friends. The invitation is gleefully accepted.