Sky key: an Endgame novel

Sequel to: Endgame: the calling.-Sarah Alopay has found Earth Key and she is winning. Aisling Kopp is approached by the CIA ; they want to stop Endgame as much as she does. Hilal ibn Isa al-Salt knows something other Players do not. A secret that possibly might help humans defeat the beings behind Endgame. Now Sky Key must be found, and all nine Players will stop at nothing to get it.