Why was the book Upstairs banned?

There is no widely known book titled "Upstairs" that has been banned. It is possible that you are thinking of a different book with a similar name or that the book you are referring to was banned in a specific location or context.

To help me understand what you're looking for, could you please provide more information? For example:

* Is there a specific author or genre you're thinking of?

* Can you remember any other details about the book?

* Do you know why you heard it was banned?

With more information, I can try to help you find the book you're looking for and understand why it might have been banned.