“I want you to come with me while I open his private safe,” continued Barthorpe. “At junctures like these there are always things that have got to be done. Now, did you ever hear my uncle speak of his will—whether he’d made one, and, if so, where he’d put it? Hear anything?”

“Nothing,” replied Selwood. “I never heard him mention such a thing.”

“Well, between ourselves,” said Barthorpe, “neither did I. I’ve done all his legal work for him for a great many years—ever since I began to practice, in fact—and so far as I know, he never made a will. More than once I’ve suggested that he should make one, but like most men who are in good health and spirits, he always put it off. However, we must look over his papers both here and at Portman Square.”

Selwood made no comment. He silently followed Barthorpe into the private room in which his late employer had so strangely met his death. The body had been removed by that time, and everything bore its usual aspect, save for the presence of the police inspector and the detective, who were peering about them in the mysterious fashion associated with their calling. The inspector was looking narrowly at the fastenings of the two windows and apparently debating the chances of entrance and exit from them; the detective, armed with a magnifying glass, was examining the edges of the door, the smooth backs of chairs, even the surface of the desk, presumably for finger-marks.

“I shan’t disturb you,” said Barthorpe, genially. “Mr. Selwood and I merely wish to investigate the contents of this safe. There’s no likelihood of finding what I’m particularly looking for in any of his drawers in that desk,” he continued, turning to Selwood. “I knew enough of his habits to know that anything that’s in there will be of a purely business nature—referring to the estate. If he did keep anything that’s personal here, it’ll be in that safe. Now, which is the key? Do you know?”

He handed the bunch of keys to Selwood. And Selwood, who was feeling strangely apathetic about the present proceedings, took them mechanically and glanced carelessly at them. Then he started.

“There’s a key missing!” he exclaimed, suddenly waking into interest. “I know these keys well enough—Mr. Herapath was constantly handing them to me. There ought to be six keys here—the key of this safe, the key of the safe at Portman Square, the latch-key for this office, the key of this room, the latch-key of the house, and a key of a safe at the Alpha Safe Deposit place. That one—the Safe Deposit key—is missing.”

Barthorpe knitted his forehead, and the two police officials paused in their tasks and drew near the desk at which Selwood was standing.

“Are you certain of that?” asked Barthorpe.

“Sure!” answered Selwood. “As I say, I’ve been handling these keys every day since I came to Mr. Herapath.”