Joam Garral offers his daughter's want to journey to Belém the place she needs to marry Manuel Valdez. They tour down the Amazon River the usage of a large trees raft. At Belém, Joam plans to repair his desirable name, as he is nevertheless desired in Brazil for a crime he did no longer perpetrate. A man named Torres, provides Joam absolute proof of Joam's innocence however the charge that Torres desires for this records is to marry Joam's daughter. The proof lies in an encrypted letter. When Torres is killed, the Garral household ought to race to decode the letter earlier than Joam is executed.

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THE MAN who held in his hand the document of which this strange assemblage of letters formed the concluding paragraph remained for some moments lost in thought. It contained about a hundred of these lines, with the letters at even distances, and undivided into words. It seemed to have been written many years before, and time had already laid his tawny finger on the sheet of good stout paper which was covered with the hieroglyphics. On what principle had these letters been arranged? He who held the paper was alone able to tell. With such cipher language it is as with the locks of some of our iron safes—in either case the protection is the same. The combinations which they lead to can be counted by millions, and no calculator's life would suffice to express them. Some particular "word" has to be known before the lock of the safe will act, and some "cipher" is necessary before that cryptogram can be read. He who had just reperused the document was but a simple "captain of the woods." Under the name of "Capitaes do Mato"are known in Brazil those individuals who are engaged in the recapture of fugitive slaves. The institution dates from 1722. At that period anti-slavery ideas had entered the minds of a few philanthropists, and more than a century had to elapse before the mass of the people grasped and applied them. That freedom was a right, that the very first of the natural rights of man was to be free and to belong only to himself, would seem to be self-evident, and yet thousands of years had to pass before the glorious thought was generally accepted, and the nations of the earth had the courage to proclaim it. In 1852, the year in which our story opens, there were still slaves in Brazil, and as a natural consequence, captains of the woods to pursue them. For certain reasons of political economy the hour of general emancipation had been delayed, but the black had at this date the right to ransom himself, the children which were born to him were born free. The day was not far distant when the magnificent country, into which could be put three-quarters of the continent of Europe, would no longer count a single slave among its ten millions of inhabitants. The occupation of the captains of the woods was doomed, and at the period we speak of the advantages obtainable from the capture of fugitives were rapidly diminishing. While, however, the calling continued sufficiently profitable, the captains of the woods formed a peculiar class of adventurers, principally composed of freedmen and deserters—of not very enviable reputation. The slave hunters in fact belonged to the dregs of society, and we shall not be far wrong in assuming that the man with the cryptogram was a fitting comrade for his fellow "capitaes do mato." Torres—for that was his name—unlike the majority of his companions, was neither half-breed, Indian, nor negro. He was a white of Brazilian origin, and had received a better education than befitted his present condition. One of those unclassed men who are found so frequently in the distant countries of the New World, at a time when the Brazilian law still excluded mulattoes and others of mixed blood from certain employments, it was evident that if such exclusion had affected him, it had done so on account of his worthless character, and not because of his birth.

This novel involves how Joam Garral, a ranch owner who lives near the Peruvian-Brazilian border on the Amazon River, is forced to travel down-stream when his past catches up with him. Most of the novel is situated on a large jangada (a Brazilian timber raft) that is used by Garral and his family to float to Belém at the river's mouth. Many aspects of the raft, scenery, and journey are described in detail.