In August of 1989, Duncan MacPherson-a pro hockey player from Saskatoon, Canada-vanished without a trace in Europe. With no help from the police, his parents, Lynda and Bob, drove all over the Alps looking for him, and finally found his car at the Stubai Glacier, a popular ski resort near Innsbruck, Austria. Thus began their twenty-year struggle to discover why their son had disappeared after snowboarding on a beginner slope. Had he, as the local police suggested, wandered off the beaten track and died in a remote area, or had he (as certain signs indicated) been the victim of something...