There are three rules of the Shadow Society:

Don’t show a civilian your true self.
Don’t kill anyone.
Don’t turn anyone until graduation.

Seventeen-year-old Sage risks her place in the Society and breaks the third rule to save someone’s life. If anyone finds out, she’ll be kicked out of school and shunned by the clan. 

To survive the semester she has two things to do:
Keep the secret locked tight;
And make sure the new Guardian doesn’t do anything reckless.

 But hers isn’t the only secret on campus.

There’s a Fallen on the loose and people are being brutally murdered.

Did she create a monster?