"Jimmy," said the Chief, "somebody on this side is giving those damn Huns a whole lot of information that they haven't any business getting. You know about those boats they've sunk already, of course. They're only small fry. What they're laying for is a transport, another _Tuscania_ that they can stab in the dark and make their getaway. The point that's worrying us is that the U-boats must be getting their information from some one over here. The sinking of the _Carolina_ proves that. No submarine, operating on general cruising orders, could possibly have known when that ship was due or what course she was going to take. Every precaution was taken at San Juan to keep her sailing a secret, but of course you can't hide every detail of that kind. She got out. Some one saw her, wired the information up the coast here and the man we've got to nab tipped the U-boat off. "Of course we could go at it from Porto Rico, but that would mean wasting a whole lot more time than we can afford. It's not so much a question of the other end of the cable as it is who transmitted the message to the submarine--and how! "It's your job to find out before they score a real hit." Callahan, knowing the way things are handled in the little suite on the west side of the Treasury Building, asked for the file containing the available information and found it very meager indeed. Details of the sinking of the _Carolina_ were included, among them the fact that the _U-37_ had been waiting directly in the path of the steamer, though the latter was using a course entirely different from the one the New York and Porto Rico S. S. Company's boats generally took. The evidence of a number of passengers was that the submarine didn't appear a bit surprised at the size of her prey, but went about the whole affair in a businesslike manner. The meat of the report was contained in the final paragraph, stating that one of the German officers had boasted that they "would get a lot more ships in the same way," adding, "Don't worry--we'll be notified when they are going to sail." Of course, Callahan reasoned, this might be simply a piece of Teutonic bravado--but there was more than an even chance that it was the truth, particularly when taken in conjunction with the sinking of the _Texel_ and the _Pinar del Rio_ and the fact that the _Carolina's_ course was so accurately known. But how in the name of Heaven had they gotten their information?