I absolutely adored this and am not really sure why.
I suppose it is because the puzzles, although mighty hard, were of the cypher and code sort which I like. (You ought to see my pages of notes, and columns of letters and numbers!)
It was also a pretty "grown up" Nancy Drew with a serious storyline. This "grown up" feel was aided by not having Bess at the end of the phone. In fact, I found Carson Drew pretty intimidating, his voice acting was that good.
I usually like Ned but, like Jenny100, I found the constant stupid texts towards the end of the game quite irritating and out of character. It was as though HER suddenly felt they had to put a few teenagery flourishes into a game that was becoming too serious and adult.
I didn't find it a very scary ND which I normally like, but in this game it didn't seem to matter.
There were a couple of odd things in the game (and I'm not sure how to phrase them without introducing spoilers and I haven't learned how to mask a spoiler). The base clef seemed to have the wrong notes - or am I incorrect in this? Also there is a poem that seems to get deciphered by itself although there are clues which appear to invite Nancy (or you and me) to try to solve it. Finally, toward the end of the game, if the procedure involving the cards is done in the wrong order you can't progress or get back. Frequent saves prevent this from being a problem.
I'm not a Scot but I found the Scottish accents were really good with just a couple of small lapses. In fact, all the voice acting was excellent.
The timed puzzles were a strain and a pain, as always. I did manage them but only with a lot of practise. And that makes them tedious rather then the joy and delight that solution of a puzzle usually brings.
But overall the game gets an A- from me.