specific
instructions. That definitely eliminated the tower.
Now, as he considered everything in the sober light of day, Harry wondered what had happened in the
house while he had been outside, watching the strange events.
Had his absence been noted?
That was quite probable. He had stepped out merely for a breath of air. He had been gone at least half
an hour. Any one of the three men might have entered the living room while he had been gone.
Harry had not noted the time at which the phenomena had occurred; but he knew that it must have been
considerably after nine o'clock. Probably along about ten thirty.
If these spectral forms would appear again to-night, Harry would be able to see them when returning to
the island. For he had determined to find some excuse to keep that nine-thirty appointment with the
messenger.
After breakfast, Harry took a short stroll down to the lake. There he looked out and tried to figure the
spot from which the phantom form had arisen.
He picked a place for observation; he sighted carefully beyond the dock. Then he turned and looked up
at the tower.
It was apparently a single room, shaped square, with a small lookout window in each wall. Certainly a
good place for observations.
As Harry turned to walk closer to the lake, he saw Marsh standing on the dock. The man turned away
suddenly.
He had seen Harry's actions. That was evident. But the man said nothing when Harry approached. He
had come to make repairs on the dock; and a few minutes later, Crawford arrived from the house.
The bearded man stepped into the motor boat, and started for the mainland.
HARRY went back to the living room. He had been there only a few minutes, when he heard the buzzer
four times. It was his signal to meet Professor Whitburn. Answering the summons, Harry knocked at the
door of the study; then entered.
Stokes was in the room with the professor.
Professor Whitburn pointed to a chair; Harry sat down to await instructions.
'How is the work coming?' questioned the old man.
'Slowly,' replied Harry.
'Very good,' responded the professor warmly. 'That's an excellent sign. I did not expect that you would
take much interest in textbooks that had no apparent purpose. You are a man who likes active duties.
You will begin them soon.'
The old man was about to turn away, when Harry interrupted.
He was sorry that Stokes was in the room. Ordinarily, Professor Whitburn spoke with each man
individually. To-day his instructions had been so slight that he had evidently not bothered to dismiss
Stokes.
Yet Harry knew that it was essential to take advantage of this opportunity, if he wished to go ashore that
night.
'Professor Whitburn,' said Harry, 'I think it will be necessary for me to run down to the town of Lake
Marrinack.'
'Why?' questioned the old man sharply.
'On account of my car,' explained Harry. 'I left it at the garage there. I had expected to make other
arrangements. Since I shall be here for three months, at least, I think it would be wise for me to make
some definite agreement with the garage man.'
'Can Stokes attend to it when he goes for the mail?'
'Hardly, sir. I have the licenses, and the title; I think it would be best for me, as owner, to attend to the
matter myself.'
'Very well. You can go with Stokes this afternoon.'
'There's just one objection,' replied Harry. 'The garage owner is not there during the day. He does not
arrive until after eight or nine o'clock. I believe that shortly after nine would be the best time to see him.'
'All right. Stokes will take you over to Harvey's Wharf when you wish to go. You can walk down to the
village—there is a short cut, I believe. Isn't that so, Stokes?'
Harry's gaze turned toward the man with the twisted face. Stokes grunted an affirmative reply. His eyes
were fixed on Harry; yet his features betrayed no suspicion.
The professor made a notation on a pad:
'Vincent out at nine o'clock,' he muttered. Then, speaking aloud, he said to Harry:
'Did I remind you, Vincent, that I would like you to stay in the house after eight o'clock, unless you notify
me beforehand?'
'Very well, sir. I didn't know that.'
'Ah!' The professor's exclamation showed the quickness of his mind. 'Did you go out last night,
Vincent?'
'Yes,' answered Harry promptly. 'I walked down to the lake to obtain a breath of air. It was chilly out; I
did not remain there long.'
'I see,' replied the professor. 'Notify me in the future, Vincent. We have certain rules here which every
one obeys. I have told you some of them.
'One is to remain quiet after eight o'clock; for I often do important work in the evening. No radio. No
going out. Each man must be on hand—except, of course, when he notifies me and receives my
permission to be away.'
'Very good, sir.'
'Let me remind you,' said the professor, 'that you must be careful in this house. I have chemicals and
mechanical appliances which are dangerous.
'Doors that are locked are kept that way with a purpose. Those that are unlocked may have been left
open through negligence.
'If anything occurs that seems to demand investigation, notify me before you proceed. You will learn
everything by degrees. So be patient.'
WITH this admonition, the old man dropped the subject, and immediately became engrossed in his
work.
Harry threw a hasty look in the direction of Stokes. He wondered if the man had suspected the extent of
his visit outdoors, last night.
Professor Whitburn had given the matter no special consideration. He had not questioned if Harry had
seen anything unusual. But perhaps Stokes was thinking on the subject.
The man was looking at Harry, but his twisted face showed nothing. Whatever Stokes might have in mind
was not revealed to Harry Vincent.
Taking the books that the professor had pointed out, Harry left the study.
When six o'clock arrived, he tuned in on Station WNX; but no message came to-night. This was his last
opportunity to listen in; for the taboo on the radio began at eight.
During dinner, Harry reminded Stokes that he was going to the village. He suggested that they leave
shortly before nine o'clock. Stokes gruffly replied that that suited him.
The brief exchange of conversation made no visible impression on Marsh; but Harry was sure that
Crawford had made note of it.
The bearded man was a difficult fellow to analyze. Harry still regarded him as the real menace on Death
