16 year old Olivia has never lived a normal life. After her father’s sudden disappearance and her mother’s murder by a stranger asking about money, a series of strange events occur. These include weird phone calls and a black limousine that always seems to be following her every move.
The people in the limo turn out to be secret agents of an organization called the S.A.O.A, the Secret Agents Organization of America, which is a top secret organization run by the C.I.A. Olivia’s life turns upside down when two people - a friendly female agent identified as Agent 7, and Agent 12, a handsome dark-haired blue-eyed agent, gives her answers to nearly all her questions about these problems. The solution? To become a member of the S.A.O.A.
Her mission is to go undercover as a student at a nearby high school and find people that have formed an alliance with her mother’s killer. She soon becomes close friends with a boy that seems to like her for her. But what he doesn't know is that who he believed to be Rebecca Thompson is actually Olivia Poole, the girl who everyone knows went missing.
People are disappearing fast, and the wanted killer is still out there. So Olivia has no choice. She has to face pain, danger, and heartbreak. She has to become Agent 13.