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That shriek was the most fearful and uncanny sound the boys had ever heard. There was a diabolical malignance about it, like the scream of some bloodthirsty animal, yet there was no mistaking the fact that it was uttered by a human being.
As the quavering notes died away, the bare walls of the old house flung back the echoes so that the shriek seemed to be repeated again and again, but on a smaller scale.