“Orders received,” he said.
The phone hung up, Harry returned to the window.
“We are to stay here,” he said. “Check the time of Warwick’s departure. We are not to follow him. The Shadow evidently knows Warwick’s business here.”
“You have no idea—” began Clyde.
“I have an idea, of course,” returned Harry, with a low laugh. “It is entirely my own; but I believe Stanley Warwick has received a tip.
“From some source unknown to himself, he has received information that has enabled him to piece together fragments of the Gunner Macklin mystery. His visit here tonight is the result.”
“That sounds feasible,” said Clyde. “Yet, after all, we do not know.”
Harry Vincent, standing back from the window, was lighting his pipe. Clyde Burke could see his face illuminated in the tiny glare of the match. He saw his companion’s lips move slowly as they phrased the cryptic sentence:
“Only The Shadow knows!”