"That would explain much that is strange that has happened about
the house, too."
Just then Zita stepped forward with the plan in her hand. "See," she
cried, "there is a secret passage marked on this."
Locke studied the plan for some time, but whoever had drawn it had
carefully concealed both the exact location of the passage and the
method by which it was reached. As he searched, however, an idea
occurred to Locke.
"I'll rig a trap with a camera," he decided, finally.
A few minutes later he returned to the room with his special
quick-shutter camera, a flash-bag, and a ball of light twine. Carefully
he focused the camera on the wall where the plan showed the secret
passage to be. Then he rigged up the flash-bag and connected the whole
with the twine, which he strung all about the Graveyard of Genius, so
that, should any part of the wall move, it would cause the twine to
break which in turn would at the same time release the shutter of the
camera and explode the powder of the flashlight. Thus, without any
direct human agency, a photograph would be taken.
Next he attached wires and ran them to the library above, where he
installed an annunciator, the needle of which would indicate when the
trap was sprung and the picture taken.
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