Tells the story of Isabel Grameson, an upper-class Peruvian woman who in 1741 married Jean Godin, a member of a team of French mapmakers exploring South America, focusing on her three-thousand-mile trek down the length of the Amazon to reach her husband after they were separated on opposite sides of the continent--victims of international politics.

A Sunday in 1769 -- Not quite round -- A daughter of Peru -- The mapmakers -- Voyage to Quito -- Measuring the baseline -- High-altitude science -- Death in the afternoon -- Marriage in Quito -- Down the Amazon -- A continent apart -- Lost on the Bobonaza -- Into the jungle -- Deliverance -- Saint Amand.