https://factburger.com/filmburger/movie/das-geheimnis-des-konigssees-2008
Das Geheimnis Des Königssees – The owner of a hotel at the river of a lake lives deeply embittered since his girlfriend disappeared in mysterious circumstances more than 20 years ago. But when one day he sees on television a young woman with a remarkable resemblance to her, he decides to hire her. Her presence increases his sick obsession to recover his lost love.