
I'm of two minds on this. I feel like it does imply a decently interesting story, but the poem itself isn't that great (e.g. "bone, and give you the firmest backbone"), and I think that you could have done a lot more to explore the story, even within the confines of a poem that only implies stuff. I'm also not a fan of the Library being a home of ideas that aren't fully developed, which is what this feels like.
I'm not really sure how much this you elided because you wanted to build mystery, and how much of it you elided because you didn't know what to say. At the moment, no vote.