16 year old mathematical prodigy who has just proved the Riemann hypothesis, the deepest problem in all of mathematics. She is the main protagonist of the novel.
Kris’s older sister, and her main support for most of the novel. Opposite to Kris in many ways, she distrusts Wallace.
Kris’s mother, who raises her and Antoinette in a modest bungalow north of Toronto.
The head agent at Four who suspects Kris may be central to the alien invasion.
A mathematical genius who is Kris’s doctoral supervisor and mentor, and the leader of the M-team.
Jasper is ex-military and thinks, like Kris, that he can communicate with the orbs.