Oh brilliant, it hadn't even occurred to me that ancientreader might have been the pinch-hitter for this round! Very cleverly reasoned, as usual :) And the concisely sharp, humorous, elegantly suggestive style of "Riddle Me" does indeed feel like her prose, now that you mention it!

And I am beyond surprise when it comes to Sanguinity at this point, so you may well be right about that one as well. I certainly consider her an excellent suspect. There are a few things about "Taste of Truth" that don't quite strike me as Sanguinity-like, I suppose, so I'll wait for the grand reveal to resolve all doubts!