"A device set there by an intelligent being, and set a long time ago. This valley wasn't arranged over night, six months ago—or even a year ago. We'll have to let the experts tell us when and for what reason. Now, let's head for home!"
He brought the flitter up and over the valley wall, flying southwest so that they passed over the gap which was the main entrance to the trap. And now he tried the com unit, endeavoring to pick up a signal on which they could beam in for a safe ride.
"That's odd." Under Hume's control the direction finder passed back and forth without bringing any answering code click from the mike. "We may be too far in the mountains to pick up the beam. I wonder...." He swept the needle in another direction, slightly to the left.
A crackle spat from the mike. Vye could not read code but the very fury and intensity of that sound suggested panic—even terror.
"What's that?"
Hume spoke without looking away from the control board. "Alarm."
"From the safari?"
"No. Wass." For a long second Hume sat very still, his fingers quiet. The flitter was on the automatic course, taking them out of the mountains, and Vye thought that their air speed was such they were already well removed from that sinister valley.
Hume made a slight adjustment to a dial, and the flitter banked, coming around on another course. Once more he spun the finder of the com. This time he was answered with a series of well-spaced clicks which lacked the urgency of that other call. Hume listened until the code rattled into silence again.
"They're all right at the safari camp."