There are some books where publisher fonts are used for only
some content, and the bulk of the book has an unspecified font. It looks like the Kindle - or at least the Paperwhite 2 - will default to Helvetica in that case.
Is there any way to change that default? I can turn off publisher font, or rip the books apart if I really need to, but I'd rather just change the fallback be Baskerville, or at least
something with serifs, if possible.
