Lane Roanoke is 15 when she comes to live with her maternal grandparents and fireball cousin, Allegra, at the Roanoke family's rural estate following the suicide of her mother. Over one long, hot summer, Lane experiences the benefits of being one of the rich and beautiful Roanoke girls. But what she doesn't know is being a Roanoke girl carries a terrible legacy: either the girls run, or they die. For there is darkness at the heart of Roanoke, and when Lane discovers its insidious pull, she must make her choice.