Ariel and Alexandra (Andy) Winchester are really closes cousins, practically sister. Ariel is Dean's daughter and Andy is Sam's daughter. Ariel is part angel part human, and Andy is part demon part human. So what happens when the family business catches up to Ariel and Andy?

Sixteen-year-old Celeste Blackwood has spent her high school years at an academy that teaches self defense techniques instead of P.E. class and how to crack computer codes instead of using the pythagorean theorem. She was taught how to shoot a gun when she was eight years old, and she knew how to take down a full grown man by the time she was ten. That's what you learn when you attend Briar Preparatory Academy, a school for young men and women training to work closely with the United States government. Things go south whenever a man by the name of Jasper Vegas seeks out vengeance on the school because of a dark past he has with the headmaster of the Academy. It is up to Celeste and her friends to find out why this man wants to see the destruction of Briar Prep. It is also their duty to defend it at all costs, whether it means life or death. Because when you are training to be a spy, courage is mandatory.