Hello, my friends. Thank you for your replies.
I upgraded to the latest version of Calibre. As advised, I entered cp1252 into preferences -> Plugins -> file type plugins, customize the html-to-zip plugin.
The em dash appears now, but a space is added to either side. Which is odd when you consider it is properly displayed in the Calibre ePub preview viewer correctly. Here are some examples:
In the HTML files (after they're exploded), my paragraph looks like this:
<p class="eBookBody">The girl looked no older than five—the age of his own son.</p>
Here's how it displays in the preview viewer:
The girl looked no older than five—the age of his own son.
But when it displays on the Nook, I get this:
The girl looked no older than five — the age of his own son.
If I could eradicate those spaces, life would be happy.
Do you all reckon this is a fault of Calibre, or of the Nook Simple Touch itself? I know these em dashes can be displayed correctly -- I've seen it correctly rendered in plenty of other books.
Thanks again, guys!
Greg