As darkness began to shroud the uninteresting landscape, the train entered the environs of a wide-spread and populous community, where huge mine buildings reared themselves from surrounding acres of the small but comfortable dwellings of North-country miners. Everywhere shone electric lights, and everywhere was a swarming population. Peveril gazed from his car window in astonishment. "What place is this?" he asked. "Red Jacket," answered his companion. "That is, it is Red Jacket, Blue Jacket, Yellow Jacket, Stone Pipe, Osceola, White Pine, and several other mining villages bunched together and holding in all about twenty-five thousand people." "Whew! and I expected to find a place of not over one thousand inhabitants." "You don't know much about the copper country, that's a fact," said Tom Trefethen, with the slight air of superiority that residents of a place are so apt to assume towards strangers. "Why, a single company here employs as many as three thousand men." Dick Peveril journeyed to the Copper Country in search of the Copper Princess, a mine inherited from his father – if he could find the mine, the people who took it, and if he could survive the wild world of the Keweenaw. His adventures in the Upper Peninsula of Michigan take him into prehistoric mines, against gun-wielding outlaws, in the face of danger and excitement - - all against the backdrop of the world's leading copper producing land of the times!