Young spy Harriet Welsch (Jennifer Stone) crosses paths with popular student, Marion Hawthorne (Vanessa Morgan), as the two girls compete to become the official blogger of their high school class. After Marion has already started blogging, Harriet is at the edge. Harriet sets her sights on a big pop star, Skander Hill (Wesley Morgan), who is in town starring in a movie, Spy Teen 2, that her father, Rodger Welsch (Doug Murray), is producing. Despite her disdain for the star of the film, Harriet starts blogging about Skander Hill and stalks him until Marion finds out. Soon she goes too far and must end it before she ruins her father's movie and Skander's career.