Williard Lyall arrived

suddenly he stiffened. The little disc had blazed to light .

 "Ah! our visitor is at the garden gate," he said gently . He folded his arms on the desk and his head lolled forward. To all appearances, Valmon Dain had fallen asleep in his chair. But one eye steady and unwinking, stared at the little box on the table waiting for the white light to flash out, telling him that Willard Lyall was at the laboratory door.

 A face peered in at the window, a face that slid cautiously inch by inch into full view behind the glass. It was Lyall. There was a frown of disappointment on his forehead ; he had not expected to find Dain still up.

 But the frown gave way to a slow smile of satisfaction when he saw all that was in the room. Fate seemed to have played Dain right into his hands.

 With a quick All-embracing look, he inspected the interior of the workshop.

  The face moved from the window, and for a tense, long-drawn-out minutes the