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The Arrow of Heaven you wouldn't protect Mr. Merton if you could, but it seems to come rather second in your thoughts. The arrangements are very elaborate, as you say, and you seem to have elaborated them. But they seem even more designed to catch a murderer than to save a man."

"Father Brown," said the secretary, who had recovered his quiet tone, "you're very smart, but there's something more to you than smartness. Somehow you're the sort of man to whom one wants to tell the truth; and besides, you'll probably hear it, anyhow, for in one way it's a joke against me already. They all say I'm a monomaniac about running down this big crook, and perhaps I am. But I'll tell you one thing that none of them know. My full name is John Wilton Horder." Father Brown nodded as if he were completely enlightened, but the other went on.

"This fellow who calls himself Doom killed my father and uncle and ruined my mother. When Merton wanted a secretary I took the job, because I thought that where the cup was the criminal might sooner or later be. But I didn't know who the criminal was and could only wait for him; and I meant to serve Merton faithfully."

"I understand," said Father Brown gently; "and, by the way, isn't it time that we attended on him?"

"Why, yes," answered Wilton, again starting a little out of his brooding, so that the priest concluded