“I have visited your uncle several times, and he has also been my guest here.”

“To be sure. I have heard Uncle Gordon speak of you. Goodby, until dusk—and thank you, much...”

Our drive, that evening, through the red-gold light of the waning afternoon, was both pleasant and uneventful. After a sultry day in the loop, it was refreshing to ride through the cool, tree-shaded north shore suburbs. Dr. Dorp, as was his wont when on the trail of a new mystery, was in the best of spirits—laughing and chatting gaily.

We arrived in Highland Park just at dusk, and presently turned into a narrow driveway which circled through a heavily wooded estate. At first no house was visible, but presently, as we wound through the darkest and gloomiest copse we had yet encountered, it came unexpectedly into view—an ancient brick homestead of the Dutch Colonial type, with gables that drooped despondently, and chimneys surmounted by double tiles that stood out against the background of gray sky like headless torsos with arms upraised to heaven.

As we drew up before the entrance, the noise of the doctor’s motor ceased, and from just beyond the background of trees, there came a throbbing, pulsating murmur which had not previously been audible to us, announcing the proximity of Lake Michigan.

Scarcely had we set foot on the porch, when the door opened silently and a gray haired, white jacketed man with burning gray eyes that looked out from hollow recesses in a pale, wrinkled, and cadaverous countenance, stood aside, hand on latch, for us to enter. So loathsome in appearance was this deathlike creature that I had a feeling of repugnance even at the thought of permitting him to take my hat in his bony, claw-like hands.

After disposing of our hats, he conducted us to a commodious living room, tastily furnished, where we were greeted by our charming hostess. Then he silently withdrew, closing the door after him.

Although she maintained a brave, calm demeanor, I noticed that the hand of Miss Van Loan was trembling as I took it in mine. The doctor, also, must have noticed this, for he quickly transferred his long, slim fingers to her pulse.

“Has anything happened?” he asked consulting his watch.

“Nothing yet, but I have been oppressed by a horrible feeling which I cannot explain. I have worried, too, for fear something might prevent your coming.”