Stig & Tilde: Vanisher's Island - Stig & Tilde 1 (Stig and Tilde) (Book:1)

Stig and Tilde are just following along with tradition when they find themselves on an unexpected adventure.

Keeping with a local tradition, Stig and Tilde hop on a dinghy and head to a desert island to survive alone without adult supervision. However, a unexpected detour leads them to the wrong island and it looks like it's inhabited by something that isn't too fond of guests.