The Adventurer went on again. After a moment Han, leaning outboard over the deck rail, said: "It's not so loud, Steve. I think we're going away from it slowly."

"Or else running parallel," suggested Perry. "Anyhow, it isn't any nearer."

Another minute or two passed, with all hands listening intently. Then Phil sounded another warning. "Hold up, Steve! I may be crazy, but I'll swear there's surf dead ahead again!"

Steve motioned to Joe and, yielding the wheel after throwing out the clutch again, swung around a stanchion and crept cautiously along the roof of the main cabin and galley until he reached Phil's side. Then, dropping to his knees and steadying himself by the flag-pole, he listened. Quite plainly and, as it seemed, from alarmingly nearby, came the gentle swish-swash of tiny waves breaking on a beach. In the fog it was difficult to tell whether the sound came from directly ahead or from starboard. At all events, when Steve turned his head to port the sound was certainly at his right or behind him.

"I'll try it again," he said. "You stay here, Phil." He climbed back to the bridge deck. "Perry, are you working that fog-horn?" he demanded. "If you aren't, get busy with it!" Once more the cruiser picked up and stole forward, her nose slowly swinging around to port. Steve had given up watching the compass now. All he wanted to do was find clear water. The swish of surf died away by degrees as the Adventurer edged cautiously along and, after five minutes, Steve gave a sigh of relief. "I guess we're all right now," he muttered to Joe, "but I'm going to keep her just moving. We might anchor, I suppose, but it's dollars to doughnuts we'd have to spend the night here; wherever here is," he added, scowling resentfully at the chart. "Look here, Joe." He reached forward and laid a finger on the map. "Here's where we were, or where we ought to have been, when we heard the surf first. According to this we were a good mile from the shore and the only shoal is that one and it's marked six feet at mean low water. There's a black-and-red spar buoy there, as you see, but we haven't sighted it. Now, what I want to know is how the dickens we could have got a mile off our course to starboard. Also, if we are off our course, where are we? Unless we've slipped over the beach and got into that pond down there—"

"Steve! Back up! We're running on the rocks!"

It was the frenzied voice of Phil in the bow. Steve thrust Joe aside and seizing the clutch put it quickly into neutral.

"Bring the boat-hook here!" shouted Phil. "Reverse, Steve! Hard!"

But Steve had already slammed the clutch into reverse and pulled down the throttle. A mighty thrashing and foaming sounded astern and the Adventurer trembled, hesitated and began to churn her way backward. Perry, boat-hook in hand, was sliding and stumbling along the wet deck. He reached the bow just in time to see the menacing face of a high stone jetty disappear again into the mist. Phil, clinging to the flag-pole, was sprawled on the deck with his legs stretched out to fend the boat off.

"Just in time!" he muttered, pulling himself back to safety. "Did you see it, Perry!"