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.

To escape an abusive father and an arranged marriage, fourteen-year-old Sarah, dressed as a boy, leaves her Michigan home to enlist in the Union Army, and becomes a soldier on the battlefields of Virginia as well as a Union spy working in the house of Confederate sympathizer Rose O'Neal Greenhow in Washington, D.C.

When she is sent to a supersecret spy training academy because of a brush with the law, teenager Rachel Buchanan learns that she may be a reincarnated goddess, takes on missions involving a lunatic millionaire, and tries to learn kung fu without breaking a nail.