Title: Ender's Shadow (Ender's Shadow Series #1), Author: Orson Scott Card
Title: Ruins (Pathfinder Series #2), Author: Orson Scott Card
Title: Visitors (Pathfinder Series #3), Author: Orson Scott Card
Title: Pathfinder (Pathfinder Series #1), Author: Orson Scott Card
Title: First Meetings: In Ender's Universe, Author: Orson Scott Card