Aria, Emily, Hanna and Spencer were tormented by the works of an unknown blackmailer, who signed off each horror simply as -"A", for an agonizingly long time. With evil at rest, and no more "A", the four Liars take a camping trip up North in order to escape Rosewood for the summer. Surely Spencer and the others are at peace? And why is there an extra sleeping bag packed in Hanna's car?