Read it through once

The dash was more fear-inspiring than any threat could have been. How this warning came into his room puzzled John Ferrier sorely, for his servants slept in an outhouse, and the doors and windows had all been secured. He crumpled the paper up and said nothing to his daughter, but the incident struck a chill into his heart. The twenty-nine days were evidently the balance of the month which Young had promised. What strength or courage could avail against an enemy armed with such mysterious powers? The hand which fastened that pin might have struck him to the heart, and he could never have known who had slain him.