"Too bad; I must have some. There will be a drug store open?"
"At this hour? oh, yes."
"Then get me some, half a pound at least. Now move on, I hear a horse coming down the road."
"Some farmer going home. Well, I'm off, then."
"And so am I."
Half an hour later Doctor Heath was standing in his open doorway, wondering what had become of the detective, when a light touch upon his shoulder caused him to start suddenly, and turning, he saw the man for whom he watched, standing behind him, and within the dimly-lighted hall.
"Are we alone?" whispered the detective; "is the coast clear?"
