After graduating from high school, Paula spends a week on the North Sea island of Norderney with her aunt. But are there even other young people on Norderney, or are there only older folks like her aunt Gerda? While stand-up paddling, Paula accidentally sees a Jeep stuck in the mudflats. When the tide comes in, it gets pulled out of the mud. But there’s no sign of the driver. Thus, the stay at the North Sea turns out to be more exciting than expected.