Eva Zacharias moves with her family to the small Alpine town of Moosbach, where her husband Peter has been given a responsible job in the laboratory of a chemical company. Eva and her children Martin and Laura feel right at home in the small town - until strange incidents occur in the rural idyll. Ingo, her son Martin's asthmatic friend, faints while swimming in the river. Eva senses that this is far more than just a harmless swimming accident..