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. 

Annotation: 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.