The wind had freshened and was now blowing at a lively rate. Andy and Frank sprang to the sails, even hoisting a small jib which they seldom used. But now they wanted all the speed they could get, for the craft which was towing the damaged motor boat was some distance away, and was rapidly drawing ahead.

“Can we catch her, do you think?” asked Andy, as he gave the tiller over to his brother.

“We’ve got to,” was the answer with quiet determination. “Suppose you get something to eat while I handle the boat? We may not have time to cook anything after we come up to them.”

“Are you going to come to close quarters?”

“I’m going to try to get near enough to see if the mysterious man is aboard, and if he is, I’m going to fire some questions at him, and let him know that he’s liable to arrest for entering our house the other night.”

“I’d like to fire something else besides questions at him. I’ve got my small rifle aboard.”

“None of that!” objected Frank quickly.

“We’ll proceed on lawful lines, no matter what he does. Now, Miss Gull,” and he patted the rail of the craft, “do your prettiest. See if you can’t catch up to those fellows.”

The wind continued good and the boys’ craft slipped through the water at a lively rate of speed. Andy busied himself in the galley, whence soon came the appetizing odor of coffee, bacon and eggs.

“Hurry up with that!” called Frank. “I’m as hungry as a crab.”

“It’s almost ready,” replied his brother. “Shall I bring it up, or will you come down?”

“You get yours first, and then relieve me. I don’t want to eat with one hand and steer with the other. Only don’t be all morning, and leave some for me.”

There was enough, as Frank soon discovered, and when he came up on deck again he found Andy leaning against the tiller and peering at the distant vessel through the binoculars.

“Can you make out anything?” he asked.

“No, I can see several men aboard, but I don’t notice our mysterious friend.”

“Do they seem to be paying any attention to us?”

“Not a bit. Guess they don’t even know we are here. I don’t believe we are going to catch up to them, though.”

“Oh, yes we are. The Gull is plenty fast, and they are handicapped by dragging that motor boat in the water. It must be partly filled, as it sets so far down, and that makes it all the harder to tow. We’re gaining on them.”

“Not so’s you could notice it.”

“Oh, well, we’ve got all day, and grub enough for another night. I’m not going to give up this chase until I have to, or until I’ve solved the mystery.”

“And I’m with you.”

There is not much excitement in a sailing race, as the boys very soon found out. There was nothing they could do, which would have been the case in a motor craft, to add to their speed. All they could do was to sit and let the wind carry them. And they were glad to see that the breeze was continually freshening.

“There’ll be another gale before night, if this keeps up,” predicted Frank.

“Let it,” assented Andy. “The Gull likes heavy weather, and we can stand it.”

“Yes, but father and mother will be worried about us. If it comes on to blow too hard we’ll have to turn back.”

“And let that man get away?”

“There’d be no help for it. But we haven’t turned back yet, and now his craft ought to be easy to trace.”

Once more they looked through the glass at the vessel ahead of them. They could see sailors moving about on deck, but that was all. No sign of the tall dark man was visible.

“Perhaps he isn’t aboard,” suggested Andy.

“It can’t be helped,” answered his brother. “We want the motor boat almost as much as we want the man, and we can’t take our choice I’m afraid. But we are certainly creeping up on them.”

This was true, for while two miles had at first separated the vessels, the distance was now narrowed to a little less ............