So here's how you turn a book into a storage vault:

Find a decent-sized hardcover book. About a quarter to a third the way in, cut a square-ish hole in the center like a picture frame, going down to the end. Keeping the "loose page" first parts separate with a towel, carefully soak the rest of the cut pages in glue like a millefeulle papier mache. Once dried, glue is very solid. Do it one last time one-sided on a final page to make the "entry" page clean of glue-damage and let dry. Put your object into the book (flask into a bible is a popular pick, or just jewelry) then close your book. If you didn't screw up, you can even open the book and flip a few pages without the storage area being revealed. For additional effect, have an obvious cheap safe with costume jewelry in it.

I mean what? Sarcastic comment about reading. Sarcastic quip about education.