That's pretty interesting but ideally, I'd be able to upload my own book (txt, pdf, epub) and interact with it. It's lacking implementation details so not sure if you use embeddings, fine tuning or a novel approach.
Each book is best at answering questions on its own source material. For now though, it will sometimes answer stuff not related to the book.
The litmus test I use is always asking a new book "Do you know anything about the Chamber of Secrets" -- often times will say no. Sometimes will return the most semantically similar thing it can find.
https://www.konjer.xyz/the-alchemist (disclaimer: built by me)
What specifically is missing from the answers in your opinion?