"And so can other men. There is a way. I need your help desperately, Curt—"

The face of the aging biochemist contorted again with unbearable pain. His forehead beaded with sweat as he clenched his skull between his vein-knotted hands.

"Dell! What is it?"

"It will pass," Dr. Dell breathed through clenched teeth. "I have some medicine—in my bedroom. I'm afraid I'll have to excuse myself tonight. There's so much more I have to say to you, but we'll continue our talk in the morning, Curt. I'm sorry—"

He stumbled out, refusing Curt's offer of aid with a grim headshake. The fire crackled loudly within the otherwise silent room. Curt felt cold at the descending chill of the night, his mind bewildered at Dell's barrage, some of it so reasonable, some of it so utterly confused. And there was no clue to the identity of the powerful force that had made so great a change in the once militant scientist.

Slowly Curt mounted the staircase of the old house and went to the room Dell had assigned them. Louise was in bed reading a murder mystery.

"Secret mission completed?" she asked.

Curt sat down on the edge of the bed. "I'm afraid something terrible is wrong with Dell. Besides the neurotic guilt complex because of his war work, he showed signs of a terrific and apparently habitual pain in his head. If that should be brain tumor, it might explain his erratic notions, his abandonment of his career."

"Oh, I hope it's not that!"