When the girls from Rosewood hear about a exchange program, they jump at the chance to get away from A. They find they can't escape in Middleton, and have new enemies they must face with the help of 2 teen heroes. Before Graduation and after Killer.

Courtney DiLaurentis has left her old life behind. When she finds herself in Middleton, Colorado, and meets two famous teen heroes, can she really start anew? But those who forget the past... Sequel to "Pretty Little Secret Keeper." Pre-Graduation.