In reading order
Endgame: The Calling
James Frey
The Pawn
Skye Warren
Endgame: Sky Key
Nils Johnson Shelton, James Frey
The Knight
Skye Warren
Endgame: Rules of the Game
Nils Johnson Shelton, James Frey
The Castle
Skye Warren
The King
Skye Warren
The Queen
Skye Warren
Endgame: The Complete Training Diaries
James Frey
Endgame: The Complete Zero Line Chronicles
James Frey
Endgame: The Complete Fugitive Archives
James Frey