Captain Cornell leaped to the front, seized the crank and began to spin it. One turn, two, without result. He cast a glance of dismay toward the disappearing car bearing Ramirez and Ramon away. Then he gave the crank another desperate turn. This time the response was instant. There was a sputter. Bob fed more gas. Then the engine broke into a roar, and the old car shook and rattled as if with ague.

“All aboard,” sang out Bob, who was now in the grip of the spirit of adventure, and had cast scruples to the wind. They needed a car, and Captain Cornell was an American Army officer. They could commandeer this flivver, if they wanted to! While Bob was thus consoling himself, he was at the same time steering the car out into the road.

Captain Cornell leaped into place beside him, just as the big blue car rounded the distant curve of the amphitheatre.

“Give her the gas,” shouted the flyer. “Let’s go.”

CHAPTER XII.
A HOUSE OF MYSTERY.

They went.

As Bob raced down the rutted roadway, there were only two thoughts in his head. Would they be able to keep Ramirez in sight? And would their commandeered car hold together? It creaked, groaned, squeaked, grated, whined and wheezed, but—it covered the ground. And, gaining confidence in his vehicle, Bob opened the throttle to its fullest extent. The ancient car seemed to leap from ridge to ridge of the rutted road like a mountain goat jumping from crag to crag. And like the goat it made most amazing speed.

So much so, in fact, that when again Bob caught sight of the midnight blue car ahead, he had gained on it. His first question was answered. At this rate of speed he most certainly would be able to keep Ramirez in sight. In fact, he cut down his speed in order not to close upon Ramirez to the point where he might arouse the latter’s suspicion.

Thus the two cars, parted by the length of a city block, burrowed by means of the bumpy dirt streets deep into Nueva Laredo. The sun shone hot and dust, whirled up by a brisk wind and further stirred by their passage, settled upon them in choking clouds. Here and there some ancient crone slumbered in the open doorway of a hut, seeking the comparative coolness created by the draught of heated air through the doorway. But otherwise the streets were deserted. Everybody who could walk, crawl or ride had gone to the bull fight.

This way and that bounced Captain Cornell on the frayed seat beside Bob.