Kay Verdant isn't your typical high school sophomore. With her unique skill set, her extracurricular activities include catching criminals on dangerous missions and foiling evil schemes, topped off with finishing her homework. How does she do it? She attends Henderson High School, a school for spies, and learns the tricks of the spy trade. Together with her brother, Roy, and best friend, Scarlet, Kay completes her operations flawlessly. She's always on target with her missions, until one day Kay meets an enigmatic stranger who changes her aim. When an underground tycoon threatens one of the world's most precious cities, she finds herself having to trust this new, mysterious ally. She starts to wonder if life really is black and white, or if there are shadowy grays that can turn her entire world upside down. Kay Verdant soon learns that the line between herself and the other side of the law isn't always so clear.