From the Pulitzer Prize-winning historian, a "suspenseful" (WSJ) and "adrenaline-fueled" (Outside) entwined narrative of the most adventurous year of all time, when three expeditions simultaneously raced to the top, bottom, and heights of the world. As 1909 dawned, the greatest jewels of exploration—set at the world’s frozen extremes—lay unclaimed: the North and South Poles and the so-called “Third Pole,” the pole of altitude, located in unexplored heights of the Himalaya. Before the calendar turned, three expeditions had faced death, mutiny, and the harshest conditions on the planet to plant flags at the furthest edges of the Earth.