Suppose that Crull or Vernon should choose to act to-night? They might attack Harry; or their mysterious confederate might be called into action again.

Who was that fellow?

Harry suspected that he was the man who had driven into the yard beside the farmhouse, the evening that he had come to Brookdale.

Harry mapped his course. He would wait until nine o’clock. The Shadow would probably give him advice. Yet, the situation was much more complicated than he had indicated in his report.

If The Shadow said to wait until tomorrow, the situation would be difficult. An order to send another report, and to discuss matters direct by wireless, would be the best way out.

One thing about The Shadow. He liked to see his men act independently in an emergency, provided they worked with intelligence. That left a way open for Harry.

His final resort came to mind as he approached Blair Windsor’s house.

If the enemy appeared ready to strike, Harry could tell everything to Windsor — eliminating any direct reference to The Shadow. With Buckman and Harper, they would have a force equal to the enemy.

Good old Blair Windsor! — thought Harry. A likable chap, who had had a lot of trouble lately.

His brother accused of murdering his friend, Frank Jarnow. Perry Quinn an attempted suicide. Now, this unknown danger hovering over him — enemies at work with a secret entrance into the very cellar of his home!