IT WAS THE EARLY 1960s. The place, a far-off corner of the Himalayas long fabled in Tibetan tradition to be hiding a valley of immortality among its peaks and glaciers—a real-life Shangri-La. They waited generations for the prophesied lama to come, the one with the secret knowledge of how to ‘open’ the Hidden Land. Then, one day, he came. His name was Tulshuk Lingpa.

THIS BOOK TELLS THE TRUE STORY of this charismatic visionary lama and his remarkable expedition. Against the wishes of the kings of both Sikkim and Nepal, he and over three hundred followers ventured up the snowy slopes of the third highest mountain of the planet. Their aim: to open a crack in the very fabric of reality and go to a land we would all wish to inhabit if it were only there—a land of peace and concord.

FORTY YEARS LATER, the author spends over...