The most likely central idea of the given passage is that <u>Marlow believes he and his crew have literally time-traveled to the Stone Age.</u>
According to the given passage, the narrator talks about his journey with a group of people who were wanderers on a prehistoric earth and fancied themselves to be conquerors, taking possession of that place.
In Heart of Darkness is a story told about Marlow who journeyed to Congo, Africa and he has a twisted concept of reality where he believes he has literally gone with his crew to the Stone Age.
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It is about Gordon korman using the item as the next future item in the case of the continuing investigation. The protagonist says the character of the secretary is the only territory of the England in the northwest. Therefore the protagonist is saying that Gordon is using the future time telling as the next best item. Good luck :)