Local tradition states that when a child turns fourteen, they have to survive all alone on an island for one year. Now, it's time for Stig and Tilde to take up the challenge. But when an accidental detour leaves them stranded on the wrong island, they find out there's more to their surroundings than meets the eye ...

Translated from the French. Original title: Stig & Tilde: L'île du disparu.