Ok, so, maybe I'm a little neurotic about some things. A friend got me the above-mentioned book, and I'm skimming the liner notes. There's a reference to Delia Bacon that says "who thought her namesake, Francis Bacon, authored the plays."
Delia Bacon did indeed think that Francis Bacon wrote the plays, but to the best of my knowledge they were no relation.
So naturally, rather than read the book, I began the hunt for her section. There's neither index nor table of contents in the book, so I had to jump and skim to the logical place where she'd be mentioned. Sure enough, it again called Francis Bacon her "namesake", although in context it does mention that there is "no genealogical connection" between the two.
Ok. Phew. I can actually read and enjoy the book now.