With their parents on vacation, Tommy and Annika spend time with their wonderful friend Pippi Longstocking at her cottage Villa Villekulla, until she finds a bottle with a message from her father Captain Efraim Longstocking, who warns her that he was captured by a band of evil pirates led by Blood-Svente and Jock the Knife, who hold him prisoner in their castle on the island of Porto Piluse, so they can find the secret location of his treasure. Pippi, Tommy and Annika then travel to Porto Piluse to rescue her father before he is forced to reveal the whereabouts of his treasure...