Well, maybe not a dark secret. It’s actually pretty cool. Carpenter Brian Grabski needed a place to hide… something… and built an exceptional concealment method into this custom bookcase.
To open the compartment, you first open all the drawers at once, and a pin pops out of a concealed location. You then turn the pin, which activates the mechanism, and opens the secret compartment. Now personally, I went with the briefcase stuffed under the bed to hide my porn. It was portable, and more or less secure for the casual snoop. This is way more serious than I ever was about it. And really, much cooler.