Seven Black Diamonds (Seven Black Diamonds Series, Book 1)

the long version

Lily's father has always shielded her from the truth, but when she's sent to the prestigious St. Columba's school, she's delivered straight into the arms of a fae Sleeper cell the Black Diamonds. The Diamonds are planted in the human world as the sons and daughters of the most influential families, and tasked with destroying it from within. Against her will, Lilywhite's been chosen to join them . . . and even the romantic attention of the fae rock singer Creed Morrison isn't enough to keep Lily from wanting to run back to the familiar world she knows.