upon his mind and clamouring for an answer, must soon send him mad.

And still before him floated perpetually a picture of long, dark,
lonely roads, of a rushing motor-car driven by a lovely girl, of the
awful thing hidden in the car behind her.

Dully he recognized that the opportunity for which he had watched
and waited so patiently had come and gone a dozen times, for Deede
Dawson had now quite relaxed his former wary care.

It was as though he supposed all danger over, as though in the
reaction after an enormous strain he could think of nothing but the
immediate relief. He hardly gave a single glance at Dunn, whose
faintest movement before had never escaped him. He had even put his
pistol back in his pocket, and at almost any moment Dunn, with his
unusual strength and agility, could have seized and mastered him.

But for such an enterprise Dunn had no longer any spirit, for all
his mind was taken up by that one picture so clear in his thoughts
of Ella in her great car driving the dead man through the night.
"She must know," he said to himself. "She must, or she would never
have gone off like that at that time--she can't know, it's
impossible, or she would never have dared."

And again it seemed to him that this doubt was driving him mad.

Deede Dawson entered the house and got a bottle of whisky and a
syphon of soda-water and mixed himself a drink. For the first time
since Ella's departure he seemed to remember Dunn's presence.