“I stayed away from the raid to-day to get the last bit of evidence against him I needed. And I got it—and him. He’s in jail with the rest of his gang now.”

There is little more to tell. The workings of the cattle thieves were revealed with the arrest of the entire gang. As has been related, they would run off a bunch of cattle when the signal was sent them by the Parson, who, working at the ranch, knew all its operations. Then the steers would be held in the secret valley until a favorable time to send them out to innocent buyers.

The detective’s boast that he had bought Square Z stock under the market price was not a vain one, as he had done so in order to get evidence, though it was worthless at the time. Eventually, the lawless men received their punishment.

Mr. Peck, or Mr. Munson, a name he often went by, had been sent out to Square Z ranch by Mr. Baker as soon as the boys started. He traveled faster than they, and knew when they were to arrive in Des Moines. His attempt to make friends with them was more a joke than anything else, so as to be able to send word back to their parents that they were all right.

He learned of their arrival at the ranch, and, after having worked up some clues himself, he came on, surprising them at their airship. The detective tried to solve the mystery of where the stolen cattle were hidden, but was unsuccessful. He did, however, suspect the Parson, and with good reason, and laid his plans to trap him. The latter was a “slick” rustler, though, and, for a time, baffled the efforts of Mr. Peck.

It was soon learned that one of the rustlers, who had been sent by the others to spy on the deserted camp of the cowboys on the mountain top had fired at the airship.

“Well, I suppose we’ll have to be going back to Boxwood Hall soon now,” said Bob one day, following the receipt of letters from home, in which were many congratulations on their achievements.

“Yes, but there are worse places,” commented Ned, and Jerry nodded.

“I’m glad that dad and Mr. Slade decided not to sell the ranch, and that Mr. Slade found funds for his new business enterprise somewhere else,” observed Bob.

“Well, while we have a chance, let’s take a trip in the airship,” said Jerry. “Want to come, Professor?”