The Night Masquerade

I'm interested in how this came to be 3 novellas instead of 1 longer novel. From the author's notes I gather that thought she was done and then came back to it? Which: I'm glad she did, because this was a really satisfying conclusion to Binti's story. And I guess I did like the effect of each one standing on its own, with a little room to breathe in the story? I can't imagine anyone only reading one of these, though.

Also I'm marking these as adult–which is how they were published/marketed–but I think they would also have definite teen appeal for an older/nerdier teen.