Salak undertook an epic, solo jungle trek across the remote Pacific island nation of Papua New Guinea--often called the last frontier of adventure travel. Traveling by dugout canoe and on foot, experiencing the dangers and wonders of a largely untouched world, she became the first woman to traverse PNG. Salak stayed in villages where cannibalism was still practiced behind the backs of the missionaries, meeting mysterious witch doctors and befriending the leader of the OPM guerrilla movement who fought against the Indonesian occupation of Western New Guinea.

The New York Times Book Review selected Four Corners as a Notable Travel Book of the Year, writing, "Kira Salak is tough, a real-life Lara Croft." Book Magazine called her "the gutsiest--and some say craziest--woman adventurer of our day." Edward Marriott proclaimed Four Corners to be "a travel book that transcends the genre. It is, like all the best travel narratives, a resonant interior journey, and offers wisdom for our times."