RewriteRule for Missing Pages

I have worked on this for too many hours and although it seems like it should be simple, I’m crying uncle.

I used to have a bunch of PDF files located under a directory named Papers. When I moved over to WordPress, I put these papers (many of them) in a different password-protected directory. I have no difficulty writing individual Rewrite 301 instructions for each file, but there are too many to do this way.

I need a RewriteRule that sends anyone looking for any file under the old Papers directory (https://www.mywebsite.com/Papers/*.*) to a single landing page in my WordPress site.

Someone’s help would be MOST appreciated! Thanks.