Lost with Lieutenant Pike / How from the Pawnee Village the boy named Scar Head marched with the young American Chief clear into the Snowy Mountains; how in the dead of winter they searched for the Lost River and thought that they had found it; and how the Spanish Soldiery came upon them and took them down to Santa Fé of New Mexico, where another surprise awaited them

A young American officer leads a small detachment into the unsettled Southwest to reconnoiter rivers and territory, only to lose their bearings in snowbound mountains. The men endure brutal cold, hunger, frostbite, and constant hardship while hunting, navigating, and interacting with Plains Indian groups as they search for a rumored river. Their struggle with terrain and deprivation tests leadership, discipline, and mutual loyalty. The expedition is ultimately intercepted by Spanish forces and carried to Santa Fe, where unexpected developments and consequences follow. The narrative highlights endurance, duty, and the challenges of early frontier exploration.