“I guess he has forgotten something,” laughed Fred, “or he’s after us. John, did you take anything from the table when you left the house?”

“Nothing except what I had already taken inside,” retorted John.

In response to the call of the man the departing Gadabout was delayed until he came alongside. There was a whispered conversation between him and the captain, which lasted only a few minutes. What was said could not be heard by the boys, although John was really trying to discover what the subject of the conversation was, at the same time doing his utmost to appear indifferent.

Fred, who understood the peculiarities of his companion, laughed silently as he saw John’s actions and shook his head warningly.

Quickly, however, the captain turning about gave the order to start and almost as if it had been hurled forward by some powerful and unseen hand the graceful little boat suddenly started swiftly on its return to Mackinac Island.

The speed of the motor-boat was much greater than in the morning. Indeed as the time passed and the graceful little craft darted over the surface of the water the boys looked at one another in amazement. The water seemed almost to rise and be parted by the bow. It rushed past them with a noise that was loud and almost confusing. Still the speed of the Gadabout increased. The roaring of the waters and the occasional call of the captain were all that could be heard and in a brief time the boys abandoned all attempts to speak to one another.

Darkness had fallen when at last they arrived at their destination. The lights of the many windowed hotels and of the cottages along the road were shining in the evening darkness. There was yet time, however, for the boys to obtain dinner and in a brief time all four were seated about the table, which had been assigned them when first they had arrived.

Fred was the last to enter the dining-room and as he did so his companions saw that something had greatly amused or pleased him.

“Look here, fellows,” he said as he seated himself at the table. “See what I have got.”

Drawing from his pocket a letter, which he explained he had received from the clerk on his way to the dining-room, he placed the sheet of paper on the table and began to read,—