6 books in series

Ender's Saga

Ender's Saga is a 8-book series with 6 released primary works first released in 1985 with contributions by Orson Scott Card.

First Meetings in Ender's Universe
Ender's Game
A War of Gifts: An Ender Battle School Story
Speaker for the Dead
Xenocide
Children of the Mind
Ender in Exile
The Last Shadow