If the news of the arrival of Drew Lane in this land spread rapidly, the story of his departure into a cloud spread with no less rapidity. It reached Johnny Thompson’s camp just as he was preparing to venture forth on another search for radio-active pitchblende. Like his good friend Curlie, he set his lips tight in a determination to do his utmost in avenging the death of a friend.

“He planned to drop down and face them single-handed,” he said to Sandy. “Somehow they must have found out his plans. They weakened the parachute ropes or his belt, so they would give way under his weight.”

Was this the solution? Who could say? There were many who believed it. For had not Drew Lane taken off at Edmonton airport? And had not Curlie Carson been robbed of a code message in his hotel in that very city? Who could say how many accomplices the “Gray Streak” might have in this frontier?

And after all, who was the outlaw pilot of this “Gray Streak”? There were those who believed the plane to be manned by Russians bent on raising a revolution in Canada and annexing this Dominion to Russia. “What could be more logical?” they argued. “Like the Russians, we are northern people. Our problems are their problems. How could they doubt that we would join them were the opportunity really given?”

In support of this theory, there was the gray mitten fashioned out of the pelt of a Siberian wolf-hound. It had been found in Curlie’s room. The thief had lost it.

“And yet,” another pointed out, “there are thousands of gray wolf-hounds in the United States and Canada. Their pelts are made into mittens. Such mittens may be bought and are worn in Winnipeg.”

“It’s that Chicago mail plane.” This was Curlie’s opinion. “That city is making life hard for dangerous criminals. The biggest of them all is out on bail. He is likely to be sentenced to three years in prison. What could be more logical than that he, or some one like him, should seize a plane to fly to the security that is found in wide open spaces?”

Some there were who believed that the “Gray Streak” was manned by reckless youths. This number diminished as charges piled up against this pirate of the air.

The news of Drew Lane’s disappearance brought sorrow into the camp of Joyce Mills and her father.

“He was a true friend,” Joyce said sadly.