Even 16 years after the devastating nuclear accident, the Black Forest is still considered contaminated and uninhabitable. In search of his parents, who have been missing since the catastrophe, Felix ventures deeper into the restricted area. He encounters both good and threatening elements and learns to cope with the incomprehensible. However, not only has nature changed completely, but people have as well. Time and again, Felix encounters the eerie singing, a force that no one can explain and that threatens all life.