Eight-year-old cousins Patrick and Beth find themselves in 1450's England during the War of the Roses, where they discover the missing treasures and meet the person who has been sending notes through
Cousins Patrick and Beth travel in Mr. Whittaker's invention, the Imagination Station, to thirteenth-century China, where they meet Marco Polo and Kublai Khan and are mistaken for Christian shamans.
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
Patrick and his cousin Beth travel back in time to ancient Rome, where they meet Telemachus and help put an end to the spectacle of gladiators fighting to the death.
