From the introduction: Stella is one of the countless aliens on Earth who counts the planet as her true home, and has devoted her life to its protection and security. She does this by leveraging her keen pathfinding skills to the benevolent and secretive Cooperative as a scout. She serves a cell that calls itself A325, the location of which she is careful to never disclose to anyone. Such absolute secrecy is the highest law of all of the many Cooperative cells across the Civilized Lands.