In late November 1974, filmmaker Werner Herzog received a phone call from Paris delivering some terrible news. German film historian, mentor, and close friend Lotte Eisner was seriously ill and dying. Herzog was determined to prevent this and believed that an act of walking would keep Eisner from death. He took a jacket, a compass, and a duffel bag of the barest essentials, and wearing a pair of new boots, set off on a three-week pilgrimage from Munich to Paris through the deep chill and snowstorms of winter.

Of Walking in Ice is Herzog's beautifully written, much-admired, yet...