Cammie Morgan is a CIA legacy and attends the premier school in the world...for spies. The school hosts some mysterious guests with the code name Blackthorne. When Cammie is blamed for a security breach that threatens to expose the school's top secret status, she and her friends face danger to clear Cammie's name and learn the truth about Blackthorne.

When Cammie Morgan visits her roommate Macey in Boston, she thinks she's in for an exciting end to her summer. But when you go to the world's best school (for spies), "exciting" and "deadly" are never far apart. The girls suddenly find themselves trapped in a kidnapper's plot, with only their espionage skills to save them.

When seventeen-year-old Cammie wakes up in a convent high in the Alps, she slowly comes to realize that she's been tortured, the last four months have been erased from her mind, and an ancient terrorist organization is hunting for her.