DIY SECRET HIDDEN AREA IN BOOKS - Simple to make! Grab some old hardcover books (from yardsales or the goodwill cheap). Use any box you have (even a shoe box will work). Use scissors or an exacto knife to cut the spine off several books. LEAVE cover on the two end books. Use hot glue gun to attach books together and to your box. Place jewelry, money, or even your router inside & group with other books! No one will know!