Mile-long spaceships, evil robots, galactic warlords with
maniacal laughs, and slimy green aliens with four brains
and six armpits. Don't be alarmed but we're not alone...

Enchantress from the stars
by Sylvia Engdahl (1970)

The giver
by Lois Lowry (1993)
First book in the Giver series


The city of Ember
by Jeanne Du Prau (2003)
First book in the Ember series

by Nicholas Fisk (1973)
First book in the Grinny series

A wrinkle in time
by Madeleine L'Engle (1962)
First book in the Time quintet series