The accident to Cap'n Bill's leg bad happened at about the time Trot was born, and ever since that he had lived with Trot's mother as "a star boarder," having enough money saved up to pay for his weekly "keep." He loved the baby and often held her on his lap; her first ride was on Cap'n Bill's shoulders, for she had no baby-carriage; and when she began to toddle around, the child and the sailor became close comrades and enjoyed many strange adventures together. It is said the fairies had been present at Trot's birth and had marked her forehead with their invisible mystic signs, so that she was able to see and do many wonderful things.

The acacia tree was on top of a high bluff, but a path ran down the bank in a zigzag way to the water's edge, where Cap'n Bill's boat was moored to a rock by means of a stout cable. It had been a hot, sultry afternoon, with scarcely a breath of air stirring, so Cap'n Bill and Trot had been quietly sitting beneath the shade of the tree, waiting for the sun to get low enough for them to take a row.

They had decided to visit one of the great caves which the waves had washed out of the rocky coast during many years of steady effort. The caves were a source of continual delight to both the girl and the sailor, who loved to explore their awesome depths.

"I b'lieve, Cap'n," remarked Trot, at last, "that it's time for us to start."

The old man cast a shrewd glance at the sky, the sea and the motionless boat. Then he shook his head.

"Mebbe it's time, Trot," he answered, "but I don't jes' like the looks o' things this afternoon."

"What's wrong?" she asked wonderingly.

"Can't say as to that. Things is too quiet to suit me, that's all. No breeze, not a ripple a-top the water, nary a gull a-flyin' anywhere, an' the end o' the hottest day o' the year. I ain't no weather-prophet, Trot, but any sailor would know the signs is ominous."

"There's nothing wrong that I can see," said Trot.

"If there was a cloud in the sky even as big as my thumb, we might worry about it; but—look, Cap'n!—the sky is as clear as can be."

He looked again and nodded.

"P'r'aps we can make the cave, all right," he agreed, not wishing to disappoint her. "It's only a little way out, an' we'll be on the watch; so come along, Trot."

Together they descended the winding path to the beach. It was no trouble for the girl to keep her footing on the steep way, but Cap'n Bill, because of his wooden leg, had to hold on to rocks and roots now and then to save himself from tumbling. On a level path he was as spry as anyone, but to climb up hill or down required some care.