It's Christmas and Zip and Zap are up to their old tricks. But this time they've gone too far and their punishment will be no Christmas vacation and a seemingly boring boat trip with their parents instead. To their surprise, the destination is a spectacular remote island. But a terrifying storm rolls in and they're forced to seek shelter at a mansion belonging to the eccentric Miss Pam, where children without families enjoy a paradise with no rules. Helped by their new friends, Flecky, Macky and Pippi, the brothers discover that their parents' sudden disappearance in the middle of the night is related to the mysterious secret behind the island and its strange inhabitants....