Well, I did it. I hit the "magic number" of queried agents: 100.
This means that, for all intents and purposes, the querying on Memories of the Dead has now come to an end. Should this fail, there's "Plan B"...followed by "Plan Z." After which, there is no plan, as that's the end of the road for this first book.
We'll see what develops, of course; but I still remain hopeful to the extreme. We'll get there--it all depends on how.