90% of this video is worthless–mostly, a slightly pudgy guy looking around suspiciously, as if someone were following him.  There’s also the not-insignificant matter of the Indiana Jones soundtrack.

But at the :48 second mark you do get to see how the interior latch of a secret door works.  After the guy pulls the book back (why is it always a book?  I notice the Kipling book…that should be enough of a giveaway…how many people read Kipling anymore?  Obviously, it’s a 25 cent book he picked up at a used book store), it pulls a string.  Let him describe:

I attached a gate latch at the top back of the bookcase, latching into its counterpart inside the doorframe. I used a rubberband to make sure the latch stays down for when the door is closed. A system of two pulleys feeds a string from the latch down through a hole by the secret book.

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