Das Geheimnis des Königssees (2008)

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.

Unfortunately the movie Das Geheimnis des Königssees is not yet available on HBO Max.