Bearing unusual signs of torture, the brutally murdered body of retired police officer Breuer is found at a mystical ruin. The crime scene and the unusual murder weapon - a dagger with a sun symbol on its handle - lead investigators Oberländer and Eisler back to the tragic end of the “Heaven’s realm” cult, in which 20 members participated in a gruesome mass suicide at the exact same place during a solar eclipse twenty years ago. 

Why now? The dubious journalist Liebertz has information about survivors, making him a valuable helper to the investigators, but at the same time qualifying him as a suspect. When a young woman, who as a small child was supposed to have been sacrificed as the “Heaven’s child” in the suicide ritual is kidnapped, Oberländer and Eisler must assume that fanatical cult members now want to complete the ritual during the upcoming solar eclipse. A nerve-wracking race against time to save the woman and prevent any further victims starts.