Down the long line of heavy technical books, she came to the end of the shelf.

Three books from the end she noticed a difference in the wall behind the shelf.

Hastily removing the other two volumes, she disclosed a small locked door having a scrap of paper protruding from the edge which she pulled out and upon which she read: In the event of my passing, should anyone move these books and find this door, these lines are to inform him that it is to remain untouched.

The key to it is in my safety-deposit vault at the Consolidated Bank.

The Bank will open the door and attend to the contents of the box at the proper time.
Linda fixed the paper back exactly as she had found it.