Really, it would appear to be just as well that they let this adroit second thief get the treasure in his possession, and then proceed to take it from him in turn. Besides, it might be policy to reduce the number of those against whom the boys would have to pit themselves; and one must be reckoned just the half of two.

That was the way Jack found himself putting it, as though he had to reduce the whole thing to argument. And it was surprising how many different things could force themselves into his mind in just a brief space of time. He could imagine the last creeper to have come safely off the white boat, with the treasure in his possession, perhaps even walking close by where they crouched; then would be given a signal that must result in his being attacked from every quarter at once; and surely with six of them to assist, he must be easily pulled down.

But wait, there was no need of getting so far afield, when the man seemed to be still busying himself aboard the white motor boat some way or other. While they could not see him, it was noticed that the narrow-beamed boat was shaking more or less, as though some one were moving about aboard.

Buster must recognize a very familiar movement in this, because there was the cranky Wireless, always ready to accommodate itself to the activities of any one who had the misfortune to pass any length of time on board, either as passenger, crew or skipper.

Should that heavy-set man, called Jenks by the other, chance to awaken about this time, perhaps there would be something doing speedily, for he had all the looks of a stayer in a fight, and once he detected the presence of the interloper, woe be to him. But there had not been the slightest movement to either of the sleepers; and if the intended robber of thieves was to be balked in his designs, it looked as though Jack and his chums would have to prove themselves equal to the occasion.

And so Jack’s conclusion seemed to be that it might pay them to get somewhat closer to the river bank, so that should the unknown finish his work aboard, and start to make his escape, they could head him off the better.

It was not really necessary for him to communicate all this to each one of his chums. When they saw him start to make a move they would understand what was intended, and govern themselves accordingly.

Jack raised himself to his hands and knees. Then he commenced to work his way along, with the tied-up boat as his ultimate destination.

Just as he had anticipated, every one of the other fellows started in to imitate his actions. All they wanted was an example, and they were ready to follow suit. You have seen the whole flock of sheep follow the bellwether over a low fence; and that was about the same way George and Josh and the rest did right then and there.

All went smoothly for a certain length of time; perhaps as much as three or four minutes may have passed along. Then something happened that was certainly not down on the bills; and coming so unexpectedly must have given the boys a severe shock.