Young Billy Bartram keeps a journal of his experiences learning about the plants of the colonial United States from his father, John Bartram, as they travel together gathering specimens and planting seeds.
On the eve of the French and Indian War, Billy Bartram and his naturalist father travel into the American wilderness in an airship--pursued by a party of French soldiers and haunted by a terrifying bear-wolf--on a quest to find the lost kingdom of the Welsh prince Madoc.
