"Here," said Nick somberly. "Here listening to us, knowing what I'm thinking and feeling, laughing at my unhappiness."

"Oh!" gasped Pat again. She watched her companion doubtfully. Then the memory of Dr. Horker's diagnosis came to her, and set her wondering. Was this story the figment of an unsettled mind? Was this irrational tale of a fiendish intruder merely evidence that the Doctor was right in his opinion? She was in a maze of uncertainty.

"Nick," she said, "did you ever try medical help? Did you ever go to a doctor about it?"

"Of course, Pat! Two years ago I went to a famous psychiatrist in New York—you'd know the name if I mentioned it—and told him about the—the case. And he studied me, and he treated me, and psychoanalyzed me, and the net result was just nothing. And finally he dismissed me with the opinion that 'the whole thing is just a fixed delusion, fortunately harmless!' Harmless! Bah! But it wasn't I that did those things, Pat; I had to stand by in horror and watch. It was enough to drive me crazy, but it didn't—quite."

"But—Oh, Nick, what is it? What is this—this outsider? Can't we fight it somehow?"

"How can anyone except me fight it?"

"Oh, I don't know!" she wailed miserably. "There must be a way. Doctors claim to know pretty nearly everything; there must be something to do."

"But there isn't," he retorted gloomily. "I don't know any more than you what that thing is, but it's beyond your doctors. I've got to fight it out alone."

"Nick—" Her voice was suddenly tense. "Are you sure it isn't some kind of madness? Something tangible like that could perhaps be treated."

"It's no kind your doctors can treat, Pat. Did you ever hear of a madman who stood aside and rationally watched the working of his own insanity? And that's what I'm forced to do. And yet—this other isn't insane either. Were its actions insane?"