Bob knew that the sheriff was right, but the thought of inactivity while his uncle was in the hands of gangsters galled his active spirit. However, he made the best of it and tried to doze. An hour slipped away when the exhaust of a motorboat, evidently coming at high speed, echoed through the lowlands. The sheriff sat up quickly, glanced at his rifle, and then picked up an oar and paddled their boat closer toward a thicket so that they were well hidden from the channel which passed within a short distance of the bayou where they had sought temporary refuge. The noise of the oncoming boat was clearer. “Coming fast,” grunted the sheriff, balancing his rifle in his hands. Bob, crouched in the bow, saw a gray boat shoot into sight in the main channel. It was not more than 200 feet away and only one man was in the boat. With a start he recognized the crouched figure of Joe Hamsa. Then the gray speeder was gone, only a broad, spreading wake remaining to mark its passage. The federal agent turned to the sheriff. “We’ve got to follow him. That was Joe Hamsa.” The sheriff shook his head. “We’re not following him now; still too light. Besides I know he’s headed for the island. Listen to him go!” The roar of the exhaust gradually died away and the sheriff turned to Bob. “You’re sure that was your man?” “Positive,” replied Bob. Sheriff McCurdy looked at his borrowed rifle once more and Bob saw the deep lines of the peace officer’s face tighten. They remained for another hour in the seclusion of the small bayou and before they started out again the shadows were deepening and the warmth of the afternoon was vanishing. Sheriff McCurdy started the motor of their boat and Bob pulled up the mud-covered anchor. With the motor throttle well down they started for Lost Island and Bob was thankful that their boat had an underwater exhaust which it was almost impossible to hear. After leaving the shelter of the bayou, Sheriff McCurdy operated their boat with extreme caution and just before they came within sight of Lost Island he stopped the boat and spoke to Bob. “We may be poking our heads into a hornet’s nest,” he warned. “Want to go on or wait until additional federal men can get to Atalissa and we can bring them down here?” “That might be too late,” decided Bob. “We’ll go on.” The sheriff started the motor and once more they were in forward motion, the bow of their small boat knifing its way through the waters of a larger lagoon. Chapter XXXII LOST ISLAND AHEAD ★ Ahead of them lay a long, low mass of tangled undergrowth. “Lost Island,” said the sheriff cryptically and Bob felt his blood beating faster. It was toward this spot that the black speed boat sighted by the barber had been going and it was also toward this spot that Joe Hamsa had been hurrying in the gray motorboat.