How do I find a lost audio book?

I purchased the book “ the help” many years back. I have listened to it several times Including within the past year. It no longer appears with my audiobooks. When I do a search for it, the book comes up, but indicates I have to purchase it. What has happened? All my other books are showing except for that one. Never had this happen before. How do I get it back?

[Re-Titled by Moderator]