The source of his income was not known. Some rumors had it that a rich philanthropist, realizing his value to the community, had endowed him for life. Another was that he was rich in his own name, that he owned a flat building, stocks, bonds and mortgages, and that his occupation was but a hobby. Strange hobby, you will say; yet there have been stranger, and far less useful.

Because they were honest, sincere and fearless, Drew and Howe were ever in “The Ferret’s” favor.

Drew Lane’s eyes were alight as they fell upon the insignificant form of “The Ferret.”

“What’s up?” he demanded once more.

“Mailplane brought down and robbed ten miles from here.” “The Ferret’s” voice was low and soft.

How could “The Ferret” know this so quickly? Who can say? The source of his information must have been of an obscure nature. For when Drew pressed him for details he could furnish none. Nor could he tell whether Greasy Thumb had a hand in it.

“But what’s so valuable in the Air Mail?” Johnny asked. “I thought that was for the most part personal messages, important to the sender, but worthless to others.”

“For the most part, yes,” Drew agreed. “But think of the emergencies the Air Mail is prepared to meet. A big deal in stocks is on. The actual securities must be delivered within twenty-four hours. The Air Mail brings them. Mrs. Jones-Smith-Walker, the millionaire widow, arrives in Chicago only to find that a great reception has been planned for her at the country home of her bosom friends, Mrs. Burns-Walker. Her jewels, a hundred thousand dollars’ worth or more, are in New York. Without them she will not be properly dressed. The Air Mail brings them. And who knows but that, through some secret channels the powerful, sometimes rich, sometimes poor, gang that is forever preying upon the foolish rich society folks are tipped off in advance regarding the consignment. Worth going after. What? If you don’t care for the law and have little fear of prison.

“Mind,” he added, “I don’t say this is the case. I have no information which would even lead me to suspect such a thing.

“Only one fact stands out clearly!” he exclaimed, springing into action. “The trail leads to the city. Big affairs may be pulled off by crooks in the country at times. But they always speed away to the city afterward. For it is there that they may most effectually lose themselves.