This is the incredible and tragic legend of Idilia Dubb. It is 1851 and Idilia is visiting the German Rhineland Valley. Whilst exploring in an old abandoned castle, she falls through the rotten floors. But when she discovers to her horror that there is no escaping the towering castle walls, she begins a grueling fight for survival. Only her sketch book can help her decipher the past. As no one answers her cries for help, Idilia contemplates her fate in a written record that blurs the lines between reality and fiction.

Based on the mysterious legend of Idilia Dubb - the Rhine legend from the 19th century tells that the young Miss disappeared on an excursion in the forest and never has been seen again. Twelve years later, her skeleton and her diary were found in the Lahneck Castle ruins.