“Storm ahead,” he told himself. “Sure to lose ’em unless—” There was just one chance. “Unless they run out of gas before we reach a snow cloud.

“One thing sure,” he told himself, “they’ll not lead me into a storm. Too dangerous. Safety first, that’s the order. Can’t find a landing in this desolate white world without the light to guide you.

“And yet—” His brow wrinkled. “Storms up here sometimes take on a terrific velocity. What if I run into one that is faster than my plane? No getting out then.

“Oh, well,” he philosophized, “it’s a chance you take when you agree to fly in the North, especially if you volunteer to chase an outlaw of the air.

“Outlaw of the air.” At once his mind was rife with speculation regarding this mystery ship.

“From time to time,” he told himself, “planes are stolen from their hangars just as autos are taken from garages. Not very common; but it happens. Suppose a super-criminal wishes to escape justice by fleeing from the United States? Suppose he can employ an aviator who is a thief, or even bribe him to carry him into this land of empty spaces? Who would know where to look for either the man or the plane?

“On the other hand, Russia is not far away, just across Alaska. Plenty of gas stations on the Yukon. It’s only a short quarter of an hour in a plane across Bering Straits. Plenty of reasons why some bold Russian aviator might be hovering about up here. Might be a voluntary exile. Might have Russian treasure to sell, jewels, diamonds, rubies and all that from the old days. Might be preparing to spread propaganda against the so-called ‘capitalistic nations.’

“But then,” he chuckled to himself, “a person always thinks of the most improbable solution of a mystery first. Those fellows up ahead may be just some rich young fellows from Canada or the United States bumming around up here, having what they’d call ‘one whale of a time’ at the expense of the rest of us. There are plenty of fellows who’d do just that if opportunity offered.

“And if that’s the answer,” he set his lips tight, “here’s where I teach them a lesson. No matter how rich a fellow is, he’s bound to consider the rights of others; and any fellow who takes gas from another’s cache in a land like this is not worthy of any consideration.”

He put out a hand. His motor thundered a little louder.