I have been trying to find any books or blueprints for making hidden or secret locks, latches you name it.  If you have seen the movie National Treasure, with the resolute desk, with its trick door… that is what I am looking for.  For instance, I built a hidden bar for a client, wanted to do some kind of hidden latch sequence to get the door to open.  Tried magnets and some other latches but really did not work to well.  Now I am building him a office and would like to do some hidden storage areas and drawers.  If anyone knows of some good books, Please let me know.
Thanks
Chad