https://www.tvmaze.com/shows/16923/donna-leon/episodes
For some reason we have a rather peculiar season listing for this show. From what I could tell, Das Erste don't use season numbering (or any numbering for that matter). Is there any proof that those season numbers are legit? Otherwise the show should be changed to year-based numbering. Also, English episode titles (or rather book titles) for German series seems out of place, considering that the show was never aired in English (as far as I know) :)