"Puzzle hunt experience by Futuruption LLC"--Title page verso.

In New York, Aisling Kopp believes the unthinkable: that Endgame can be stopped. Kingdom of Aksum, Ethiopia. Hilal ibn Isa al-Salt narrowly survived an attack that leaves him horribly disfigured--but he carries a secret that can help redeem humanity--and maybe even be used to help defeat the beings behind Endgame. London, England. Sarah Alopay has found the first key. Two keys--and nine Players--remain. The keys must be found, and only one Player can win.