Cammie is trying to have a normal summer, but she soon discovers that she is being hunted by a mysterious organization. She realizes that her mother and the faculty at Gallagher Academy haven't been telling her the whole truth about her past or her father.
Having survived her freshman year and a few "real-world" adventures, Cammie is back for her sophomore year. She is eager to move beyond the classroom and into the field, but she quickly discovers that being a student spy is much harder than it looks.