"Quite impossible to say," answered Jack. "The _Maranon_ will no doubt keep the Cuban coast close aboard until she gets as far east as, say, Cavana Point, and then steer about midway between Great Inagua and Hayti, keeping to the southward of all the banks, and so passing into the open Atlantic, probably `taking her departure', in the navigator's sense of the term, from Cape Viejo Francais, on the northern coast of Hayti, and striking thence, as straight across as she can go, to Fernando Po. It is my intention to go to sea to-morrow, or next day, perhaps, and lie in wait for her; after which I shall follow her at a sufficient distance to avoid arousing the suspicions of the captain, and pounce upon her at the first favourable opportunity that presents itself. But probably, if all goes well with us, they will be free again in a fortnight from to-day." "Upon my word," said Don Ramon, laughing, "it is positively exhilarating to hear the confident tone in which you talk; you are actually inveigling me into the indulgence of some sort of ridiculous hope that your enterprise will be successful! Now, let us talk for a moment or two as though that hope were going to be realised. When you have accomplished the rescue of our friends, you had better put into some Cuban port where your yacht is not known, and communicate with me by telegraph. Now, what would be the best place for you to call at?" "Really," said Jack, "I don't think it matters very much; the _Thetis_ has been into practically every port in Cuba, but that is no reason why she should not enter any of them again. For you must remember that it will be some time before the escape of the Montijo family is known; probably not until the _Maranon_ has travelled all the way to Fernando Po and back--if she is indeed to return to Havana, which, by the way, is by no means certain. How would Guantanamo do?" "Guantanamo would do very well indeed," answered Don Ramon. "Yes; Guantanamo let it be. Now, the next matter to be considered is the question of a cipher in which to communicate, for of course it goes without saying that a cipher of some sort must be used; it would never do for such treasonable correspondence as we have in our minds to be carried on in plain language, capable of being understood by every telegraph clerk or letter-sorter through whose hands it may chance to pass. You don't happen to be acquainted with any first-class cipher, I suppose?" "Yes, I do, if I can but recall it to mind," said Jack. "I met with it in a book some time ago, and it struck me as being especially good from the fact that it consisted entirely of figures, and that it was not necessary to use precisely the same figures every time to represent any particular letter; hence it seems impossible for anyone to decipher it without the key. Now, let me consider: how did it go? Something like this, I think. Can you let me have a pencil and a sheet of paper?"