The Solitary Farm by Fergus Hume — Read

As has been seen, Durgo was no ordinary man, and even had he been white instead of black, would have passed for a clever member of the Aryan race. Undoubtedly the strain of Arab blood in him sharpened his intellectual faculties, and made him ambitious to play a leading part in the history of his tribe. That the members of it were savages mattered very little, since he had been educated in the lore of the ruling race, and could raise them sooner or later almost to his own level. Almost, that is, but not quite, for Durgo had no notion that any individual of his tribe should be as clever as himself. He wished to be a despot, and rule from an autocratic throne.

The one weak point in his character -- if gratitude can be called weakness -- was his adoration of Edwin Lister. That gentleman had undoubtedly saved his life, and assuredly had aided him to attain to his present position of culture by inducing the old chief to send his clever son to England. But Cyril knew, what Durgo in his blind idolatry did not -- that Edwin Lister was not a man to work for nothing, and wanted much more than he ever gave. There was every chance that he would abuse the gratitude of Durgo, when the negro's ambition was achieved, and if his protege revolted from complying with the exorbitant demands which would surely be made on his generosity, he would speedily be reminded of what had been done for him. With an ordinary man this would have mattered little as such a one would decline unreasonable exactions.