“I have no time to waste, West. You will please turn over the books.”

“They are in the vault,” said Harvey, pointing to the side door.

McNally looked sharply at Harvey, but the young man had turned to a pile of letters. After a moment's hesitation McNally opened the door and pulled at the steel gate. As he was peering through the bars, a heavy hand fell on his shoulder.

“Here!” said a low voice. “You'll have to keep away from that vault.”

“Take your hand away!” McNally ordered.

“Come, now! Move on!”

“Mr. West, under whose orders is this man acting?”

“His superior officer's, I suppose,” Harvey called through the door without rising.

“Call him at once, sir.”

The detective beckoned to a boy, and sent him out of the room. In a moment his chief appeared.