After a word with Hunter, Tim gunned the motor of the Good News and they raced across the field and into the air in quest of the Sky Hawk. Both boys were concentrating on the task ahead.

When they neared the Rock River country Ralph nudged his companion.

“Better put on the gas masks,” he warned. “The clouds are heavy ahead of us; just the place for the Sky Hawk.”

They donned the gas protectors, ready for the Sky Hawk to strike. Ahead of them loomed a cloud, grayish-green in color.

Ralph signed for Tim to cut the motor. They soared silently. To their right and ahead of them they could hear the sound of another plane. Tim turned on his motor and ruddered hard to the right. All around them were the grayish-green clouds of gas. The Sky Hawk had laid a careful trap for the specie plane.

Suddenly they broke through the clouds. Just ahead of them a sleek, black monoplane was loafing in the sky. Its pilot, startled at the sudden appearance of the Good News, was caught unawares, and they were almost on him before he could rev up his motor.

As they roared down on the monoplane, they caught a glimpse of the pilot, his face covered with a hideous mask to protect him from the gas clouds which he had scattered through the sky.

It was the Sky Hawk, the terror of the airways!

With quickening pulse, Tim set himself to the task of riding the Sky Hawk to earth. He knew his plane was faster than that of the aerial bandit, but could he match his skill with the enemy and force him to earth?

There was a puff of smoke under the fuselage of the Sky Hawk’s plane and another of the gray-green clouds took form. But Tim and Ralph were protected from the gas and they drove through the cloud in a burst of speed.