might be involved, he asked Father Brown to call, though he made no pretence of preference for that aspect of them.
"I'm not sure I want you, you know," was his greeting. "I'm not sure about anything yet. I'm hanged if I can make out whether it's a case for a doctor, or a policeman, or a priest."
"Well," said Father Brown with a smile, "as I suppose you're both a policeman and a doctor, I seem to be rather in a minority."
"I admit you're what politicians call an instructed minority," replied the doctor. "I mean, I know you've had to do a little in our line as well as your own. But it's precious hard to say whether this business is in your line or ours, or merely in the line of the Commissioners in Lunacy. We've just had a message from a man living near here, in that white house on the hill, asking for protection against a murderous persecution. We've gone into the facts as far as we could, and perhaps I'd better tell you the story as it is supposed to have happened, from the beginning.
"It seems that a man named Aylmer, who was a wealthy landowner in the West Country, married rather late in life and had three sons, Philip, Stephen, and Arnold. But in his bachelor days, when he thought he would have no heir, he had adopted a boy whom he thought very brilliant and promising, who went by the name of John Strake. His
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