Two coven heiresses — sworn enemies in public, best friends in private — break into the new potions professor's study on a dare and walk out holding a secret worth far more than they bargained for. Forty-three chapters of detentions, chaperoned trips into a night forest, a killer loose in the academy and a prophecy with the professor's name in it, while the two of them compete over which one gets chosen and both their families would rather intervene.