After this flight the boys ordered a new engine for the Dartaway, one which would make sailing safer, especially in a stiff wind. The makers said they would send the new engine immediately, and a machinist to install it, and they agreed to take the old engine back at cost price, since it was practically new.
It must not be supposed that the Rover boys neglected their studies. As my old readers know, whatever they tackled they went at with all their might, and this applied to their work as well as their play.
"Dad sent us here to get an education," said Dick. "And while I am here I am going to study all I can. There is no telling how long I'll be able to remain here anyway."
"Thinking of dad's western affairs?" asked Sam.
"Yes; I may have to take hold and help him and Uncle Randolph out. Both of them are not as young as they used to be, you know."
"That's true, Dick. I noticed dad's hair getting pretty gray, and uncle's is almost white."
The boys had written home and also to the Stanhopes and the Lanings, and soon came letters in return. One, from Mr. Anderson Rover, was of special importance.
"I have news out of the ordinary," wrote the parent. "That man Crabtree and Tad Sobber have come back to the old mill. I got the word from Peter Marley. He says they act very suspiciously, and that a boy who works for him overheard Crabtree and Sobber talking about us. I have sent for a detective to come out from the city and watch them for a while. If anything new develops I will let you know."
"Now what in the world can old Crabtree and Sobber be up to?" asked Sam, after all had read the communication.
"Up to some trick, I'll bet a new hat," declared Tom. "I am glad dad sent for the detective. I hope he catches them red-handed at something, and locks them up."