''Northwest Passage'' is widely considered a benchmark of the historical adventure genre for its meticulous research and vivid portrayal of colonial America during the mid-18th century. The story is told through the eyes of Langdon Towne, a young artist and Harvard student who flees trouble in New Hampshire to join the army. The novel is structurally divided into two distinct parts: Part 1: Follows the legendary Major Robert Rogers and his "Rogers' Rangers" on a harrowing expedition against the Abenaki village of St. Francis in Canada. This section focuses on military strategy, extreme survival, and the brutal reality of frontier warfare. Part 2: Tracks Rogers' later years as he seeks backing for an overland expedition to find the fabled Northwest Passage to the Pacific. This half explores his time in London, his appointment as governor of Michilimackinac, and what might threaten to be his eventual personal and political downfall.