Sandra, the fairytale detective
The Princess of the Lake
S1 E40:
The fairy-tale detective Sandra and her assistant Fo travel into the legend of Swan Lake, having been called out by count Müller, a young friend of prince Siegfried, the protagonist of the story. The count is very worried. Apparently, the prince is going mad and has fallen in love with a swan. Sandra is aware that Siegfried is completely sane.