The fire has a "carousel" on the books page. The currently read book is placed there. If you have purchased or opened more than about 7 books since you opened that book, it should be visible there. If you only had it open for a few minutes, it might not be (I don't know why). If you select "Library" from the Books page, the most recent books, including most recent opened and purchased, will be at the top of that display if you have it set to sort by "Most Recent". I don't find any difficulty finding my most recent book in any of my fires (5th, 6th, and 7th generations).
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There is no such thing as a stupid question!
Corollary -- so long as you read before you post and stay on topic. :)