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.