Ooh, a hidden door to a boudoir of lingerie and sex toys? Maybe pretending to be interested in books wasn't the worst, most boring mistake I ever made to get a girl to like me after all. Yeah, babe, I do see your first edition copy of To Kill a Mockinbird. Amazing. I like this Japanese electric piston masturbator you have here too.
If you've got the handymanliness and desire, save yourself a wad of cash by installing your very own secret passage to the Bat Cave. This Hidden Door System hardware attaches to a bookshelf (not included, you gotta build that too) to create a 24" to 36" inswinging or outswinging door. Instructions--specs and diagrams--for both building the door and attaching the hinging system are included with the hardware package.