Improved contextual awareness

So I have ten PDFs of different novels/speeches/podcasts, whatever… which I insert into a single index.

If I make a query such as:
Summarize episode 100 / summarize Ted Talk 399 on AI.

It returns results from all the documents, not just the one I’m asking a question about.

Is this something I can fix with the way I’m storing and querying my data? Or do I need to do some more deep training?