This great hearted novel is the finale of Ivan Doig’s passionate and authentic trilogy about the McCaskill family and their alluring Two Medicine country along the hem of the northern Rockies. Jick McCaskill, the illustrious narrator of “English Creek,” returns as the witty and moving voice in this classic encounter with the American road and all the rewards and travails it can bring. Jick faces his family’s — and his state’s — legacy of loss and perseverance from the vantage point of Montana’s centennial in 1989 when his daughter Mariah enlists him as Winnebago chauffeur to her and her ex-husband, the magnificently ornery and eloquent columnist Riley Wright, when their newspaper dispatches them to dig up stories of the “real Montana.” Just as the centennial is a cause for reflection as well as jubilation, the exuberant travels of this trio bring on encounters with the past in “memory storms” that become occasions for reassessment and necessary accommodations of the heart.