A transparent radiance. But in a moment it was congealing, turning into
a glistening, solid shape. The faint hum of it sounded as it hung in
mid-air by the trellis.
"Not the plane," George murmured. "Then what is it?"
The humming ceased. They could see the little object clearly now; a
metal cube, each of its faces some twenty inches in diameter. It hung
for another moment, then dropped with a little thump to the rooftop.
Both the men were on their feet. Rogers said, "A message from him. An
emergency..." He picked up the cube.