Northern Lights by Tim O Brien

Under crystaline skies, in the pale winter beauty of Arrowhead country in Minnesota, Harvey and Paul Perry set out on a cross-country skiing expidition. Harvey "The Bull" is jubilant, boisterous; his brother Paul struggles to keep pace behind.
But adventure turns to nightmare when a blizzard strikes. Forced into dependence on each other, the two men are pitted against the deadly malice of a frozen wilderness and must prove their courage, honour and love if they are to survive their ordeal...