To-Ho The Golden Killer

George, born to Dutch parents, was captured as a child by the Aaps, savages intermediate between man and monkey, who took him to the bottom of the Sumatran forests. As he grew up, he became friends with one of the ape men, To-Ho, and with Van Kock, a former Dutchman who, fleeing humanity, aged among the Aaps and discovered a process to destroy gold. George's sister, Lewen, her fiancé, and an old scientist, Valtenius, decided to find him while prospecting for gold for the Vanderbeim house in Rotterdam. They do not suspect that a former partner of this company, the German Koolmaan, accompanied by Captain Ned and fifty bandits, embarked at the same time as them for Sumatra in order to take revenge for having been thanked...