“Later I went back, and as soon as possible after supper, while there was yet sunlight, I developed my second plate.
“I didn’t bring that with me, for it wouldn’t interest you. But it came out so good that I thought I might as well see what I had caught on the first plate, when the thing went off before I knew.
“That picture in your hand was what I caught.”
He paused, but Nick said nothing, and the young man added:
“I had heard your name mentioned in connection with the matter, and, as people said it was a case of suicide, I thought I ought to show you what I had caught.”
Nick drew a long breath.
“Well!” he said, “for once the brass band has been useful. I wanted to work unknown, but the fact that I am known to be on the case has brought me a piece of evidence that otherwise I might never have discovered.”
Again he looked at the picture.
“This lets Low out of it,” he murmured.
Kerr’s theory was that Low had made a mad rush for the clergyman as soon as he entered the room, pushed him from the window, and then hurried out and down the stairs.