Why on iron and steel they last with tolerable certainty
only a short time, and not much longer on silver, glass, or wood.
But they are seldom permanent unless they are made with ink or
blood or something that leaves a more or less indelible mark. That
was a 'plant.'"
"But what do you expect to gain by it?"
"Well," he replied enigmatically, "no one is necessarily honest."
It was late in the afternoon when Kennedy again visited the Godwin
house and examined the camera. Without a word he pulled the
detectascope from the wall and carried the whole thing to the
developing-room of the local photographer.
There he set to work on the film and I watched him in silence. He
seemed very much excited as he watched the film develop, until at
last he held it up, dripping, to the red light.
"Some one has entered that room this afternoon and attempted to
wipe off the walls and woodwork of that closet, as I expected," he
exclaimed.
"Who was it?" I asked, leaning over.
Kennedy said nothing, but pointed to a figure on the film.
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