Flambeau was looking round him in rather a weird way. “Do you know,” he said, “there is something about this place that--”
“Hullo!” called out the Duke sharply; “that fellow’s disappeared. Vanished, like a blasted fairy!”
“He has a key,” explained their clerical friend. “He’s only gone into one of these garden doors,” and as he spoke they heard one of the dull wooden doors close again with a click in front of them.
Flambeau strode up to the door thus shut almost in his face, and stood in front of it for a moment, biting his black moustache in a fury of curiosity. Then he threw up his long arms and swung himself aloft like a monkey and stood on the top of the wall, his enormous figure dark against the purple sky, like the dark tree-tops.
The Duke looked at the priest. “Dubosc’s escape is more elaborate than we thought,” he said; “but I suppose he is escaping from France.”
“He is escaping from everywhere,” answered Father Brown.
Valognes’s eyes brightened, but his voice sank. “Do you mean suicide?” he asked.
“You will not find his body,” replied the other.
A kind of cry came from Flambeau on the wall above. “My God,” he exclaimed in French, “I know what this place is now! Why, it’s the back of the street where old Hirsch lives. I thought I could recognize the back of a house as well as the back of a man.”
“And Dubosc’s gone in there!” cried the Duke, smiting his hip. “Why, they’ll meet after all!” And with sudden Gallic vivacity he hopped up on the wall beside Flambeau and sat there positively kicking his legs with excitement. The priest alone remained below, leaning against the wall, with his back to the whole theatre of events, and looking wistfully across to the park palings and the twinkling, twilit trees.
The Duke, however stimulated, had the instincts of an aristocrat, and desired rather to stare at the house than to spy on it; but Flambeau, who had the instincts of a burglar (and a detective), had already swung himself from the wall into the fork of a straggling tree from which he could crawl quite close to the only illuminated window in the back of the high dark house. A red blind had been pulled down over the light, but pulled crookedly, so that it gaped on one side, and by risking his neck along a branch that looked as treacherous as a twig, Flambeau could just see Colonel Dubosc walking about in a brilliantly-lighted and luxurious bedroom. But close as Flambeau was to the house, he heard the words of his colleagues by the wall, and repeated them in a low voice.
