Stunning : A pretty little liars novel / Sara Shepard.
After Alison DiLaurentis tried to kill them, Spencer, Aria, Emily, and Hanna tried to get their lives back on track. But these girls just can't stay out of trouble. First there was their disastrous trip to Jamaica, and their summer breaks were no less eventful. Now a new A is stalking them, taunting them with the very secrets these pretty little liars have been trying to forget. But this A doesn't just want to blackmail the girls--this A is out for blood