Underhill did not know how long he stood staring down at this macabre figure, when he looked up and saw a group of four figures standing above him on the bank. He was prepared for Bagshaw and his Irish captive, and he had no difficulty in guessing the status of the servant in the red waistcoat. But the fourth figure had a sort of grotesque solemnity that seemed strangely congruous to that incongruity. It was a stumpy figure with a round face and a hat like a black halo. He realized that it was, in fact, a priest; but there was something about it that reminded him of some quaint old black woodcut at the end of a Dance of Death.
Then he heard Bagshaw saying to the priest:
"I'm glad you can identify this man; but you must realize that he's to some extent under suspicion. Of course, he may be innocent; but he did enter the garden in an irregular fashion."
"Well, I think he's innocent myself," said the little priest in a colourless voice. "But, of course, I may be wrong."
"Why do you think he is innocent?"
"Because he entered the garden in an irregular fashion," answered the cleric. "You see, I entered it in a regular fashion myself. But I seem to be almost the only person who did. All the best people seem to get over garden walls nowadays."
"What do you mean by a regular fashion?" asked the detective.
"Well," said Father Brown, looking at him with limpid gravity, "I came in by the front door. I often come into houses that way."
"Excuse me," said Bagshaw, "but does it matter very much how you came in, unless you propose to confess to the murder?"
"Yes, I think it does," said the priest mildly. "The truth is, that when I came in at the front door I saw something I don't think any of the rest of you have seen. It seems to me it might have something to do with it."