Book 2

Heartsease

by Peter Dickinson

Published April 1969
At a future time in England when anyone knowledgeable about machines is severely punished as a witch, four children dare to aid in the escape of a "witch" left for dead.

Book 3

Devil's Children

by Peter Dickinson

Published April 1970
After the mysterious Changes begin, twelve-year-old Nicola finds herself abandoned and wandering in an England where everyone has suddenly developed a horror and hatred of machines.