Willian Finnegan folds the story of a fatal mountaineering expedition into a courtroom drama, with each narrative track just as tense as the other. Last year, Kerstin Gurtner froze to death on Grossglockner, an Austrian mountain whose peak extends more than 12,000 feet above the Adriatic Sea. Her boyfriend and climbing partner, Thomas Plamberger, was charged with grossly negligent homicide. Finneg...