Characters.

Astra is a young adult characterized by her vivacity, defiance, and loyalty, traits she inherited from her mother, Lyra. Cosmo, an outsider and council member who has observed Astra since her infancy, selects earthlings based on their primary traits for a one-month to one-year loyalty test. If any selected individual fails to keep the secret, the council will withdraw its protection from Earth against malevolent threats.