Beth and her cousin Patrick travel in Mr. Whittaker's invention, the Imagination station, to 1000 A.D. Greenland, where they meet Erik the Red and Leif Eriksson and witness the spread of Christianity in that country.
Shipwrecked off the coast of Greenland, Leiv Steinursson, a young Viking boy, is helped by two Inuit children, twelve-year-old Apuluk and his eleven-year-old sister Narva, and is accepted into their community, gladly leaving his violent lifestyle behind.