It was too much.  With an oath, Orlando reached for his key.  But before fitting it into the lock, he cast a look behind him.  The car was in plain sight, filling the central space from floor to roof.  A single glance from a stranger’s eye, and its principal secret would be a secret no longer.  He must not run such a risk.  Before he answered this call, he must drop the curtain he had rigged up against such emergencies as these.  He had but to pull a cord and a veil would fall before his treasure, concealing it as effectually as an Eastern bride is concealed behind her yashmak.

Stepping to the wall, he drew that cord, then with an impatient sigh, returned to the door.

Another quiet but insistent knock greeted him.  In no fury now, but with a vague sense of portent which gave an aspect of farewell to the one quick glance he cast about the well-known spot, he fitted the key in the lock, and stood ready to turn it.

“I ask again your name and your business,” he shouted out in loud command.  “Tell them or—­” He meant to say, “or I do not turn this key.”  But something withheld the threat.  He knew that it would perish in the utterance; that he could not carry it out.  He would have to open the door now, response or no response.  “Speak!” was the word with which he finished his demand.

A final knock.

Pulling a pistol from his pocket, with his left hand, he turned the key with his right.

The door remained unopened.

Stepping slowly back, he stared at its unpainted boards for a moment, then he spoke up quietly, almost courteously: 

“Enter.”

But the command passed unheeded; the latch was not raised, and only the slightest tap was heard.

With a bound he reached forward and pulled the door open.  Then a great silence fell upon him and a rigidity as of the grave seized and stiffened his powerful frame.

The man confronting him from the darkness was Sweetwater.

XXXV

THE MAN WITHIN AND THE MAN WITHOUT

An instant of silence, during which the two men eyed each other; then, Sweetwater, with an ironical smile directed towards the pistol lightly remarked: 

“Mr. Challoner and other men at the hotel are acquainted with my purpose and await my return.  I have come—­” here he cast a glowing look at the huge curtain cutting off the greater portion of the illy-lit interior—­“to offer you my services, Mr. Brotherson.  I have no other motive for this intrusion than to be of use.  I am deeply interested in your invention, to the development of which I have already lent some aid, and can bring to the test you propose a sympathetic help which you could hardly find in any other person living.”

The silence which settled down at the completion of these words had a weight which made that of the previous moment seem light and all athrob with sound.  The man within had not yet caught his breath; the man without held his, in an anxiety which had little to do with the direction of the weapon, into which he looked.  Then an owl hooted far away in the forest, and Orlando, slowly lowering his arm, asked in an oddly constrained tone: