"No, Freddie, I won't let them take our boat."
"Pooh! Just as if they could—it's ours!" spoke Bert.
"Who could it be on board here, mamma?" asked Nan.
"I don't know, dear, unless it was some one passing through the lumber yard, who stopped to see what the boat looked like," answered Mrs. Bobbsey. "Papa will soon find out."
The noise they had heard was the footsteps of some one walking about on the deck of the houseboat.
"Perhaps it was one of the men from the office, who came to tell papa he was wanted up there, or that some one wanted to speak to him on the telephone," went on Mrs. Bobbsey. She saw that the children, even Bert, were a little alarmed, for the boat was tied at a lonely place in the lumber yard, and tramps frequently had to be driven away from the piles of boards under which there were a number of good places to sleep.
Mr. Bobbsey did not mean to be unkind to the poor men who had no homes, but tramps often smoke, and are not careful about their matches. There had been one or two fires in the lumber yard, and Mr. Bobbsey did not want any more blazes.
Soon the footsteps of the children's father were heard on the deck above them, and, a little later Freddie and the others could hear the talk of two persons.
"I guess it was one of the men," said Mrs. Bobbsey.
"I'm going to see," spoke Bert, and he moved toward the stairway, followed by Nan, Flossie and Freddie. They went up on deck and saw their father talking to a strange boy. None of the Bobbsey children knew him.