I found a solution:
- Installed Sigil.
- Opened the epub in Sigil - the special characters were visible in the code editor view.
- Saved as epub, but the curly quotes still did not display.
- Returned to Sigil and used find and replace with the proper curly quotes and em dashes. It seems no intervention was required for the other special characters.
- Saved as epub and it looked OK in Calibre.
- Edited the epub in Calibre to my liking.
- Side-loaded to Nook. Done.
Very annoying that Calibre does not display the unusual encoding - if we can't see it then we can't use find and replace. The html says utf-8 but then there are dozens of character sets - confused.
I will be more selective in downloading epubs in the future - 2/3 of my first three downloads were badly authored.
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