2023-08-21 00:00:00 The app from bestselling author Stefan Osterhoff ("The Jacob children and the secret of Rungholt") takes you on an exciting journey across the island in the North Frisian Wadden Sea. Solve tricky puzzles and answer exciting quiz questions while you explore the island alone or with parents and friends and experience it in an unprecedented way. Whether well-known landmarks, cultural sites or hidden ruins, you will experience exciting tasks everywhere, learn interesting things and come into contact with a wide variety of people. Suitable for puzzle foxes of all ages. And you don't even have to wait to land on Pellworm to get started. If you already have the book "The Jacob Children and the Secret of Rungholt", you can tackle some puzzles in advance.