“No, no! Not that! Promise!”

She had drawn his head down, and now her face close to his, was trembling in her eagerness.

“Promise! Promise me, Allan! You must!”

Suddenly moved by her entreaty, he yielded.

“I promise, Beta!” he exclaimed. “Gad, I didn't know you were so deadly afraid of my little expeditions! If I'd understood, I might have been arranging otherwise already. But I certainly will change matters when I get back. Only let me go once more, darling--that'll be the last time, I swear it to you!”

She gave a great sigh of relief unspeakable and kept silence. But in her eyes he saw the shine of sudden tears.

Allan had been gone more than four days and a half before Beatrice allowed herself to realize or to acknowledge the sick terror that for some hours had been growing in her soul.

His usual time of return had hitherto been just a little over three days. Sometimes, with favorable winds to the brink of the Abyss, and unusually strong rising currents of vapors from the sunken sea--from the Vortex, perhaps?--he had been able to make the round trip in sixty hours.

But now over a hundred and eight hours had lagged by since Beatrice, carrying the boy, had accompanied him up the steep path to the hangar in the palisaded clearing.

How light-hearted, confident, strong he had been, filled with great dreams and hopes and visions! No thought of peril, accident, or possible failure had clouded his mind.