No electricity, no mobile phone network: The three !!! spend an exciting survival weekend on a deserted island. One participant suspects his sister of planning thefts while he is away. In his name! He has to stop it. Kim, Franzi and Marie help immediately. But the sister has taken precautions, the radio is switched off. How do they get off the island again? To do so, the friends have to master many tasks. And the readers help them. To get further in the story, they collect clues, cleverly combine and crack the codes. In the book, they cut, draw, fold and actively puzzle. The new volume of the Escape crime series.