Standing there, he waved his arm comprehensively towards the unoccupied land at the side and back of the building.

"Once outside, who was to see him clamber over that fence and make for the shelter of the bush?" he asked. "While you were loitering at the front door, Brennan, your man was walking out at the back."

Brennan gnawed his moustache in chagrin.

"But—how did he get out of the dining-room?" Harding exclaimed.

Durham turned slowly and looked steadily into Harding's eyes.

"He walked out, Mr. Harding, walked out through the door."

"The door was shut."

"When you saw it. It was probably closed as noiselessly as it was opened—his wife saw to that. Then, as soon as he had slipped out this way, she came to your office and threw dust in your eyes by asking where her husband was. Just the sort of thing a woman would do. What did he do with his keys—the bank keys, I mean?"

"He had them with him."

"Oh, no, Mr. Harding. They would be no further use to him. He must have left them behind him. We shall find them somewhere. Let me have a look at the safes which were robbed."