In the still of a snow-covered morning in upstate New York a girl out riding her horse is hit by a 40-ton truck. Though horribly injured both thirteen-year-old Grace Maclean & her horse Pilgrim survive. But the impact on their lives is devastating. Grace's mother Annie hears about a man called Tom Booker a 'whisperer' who is said to have the gift of healing troubled horses. Abandoning her job Annie sets off across the continent with Grace & Pilgrim to find him. Under the massive Montana sky all their lives are changed for ever.