Killer.
Author: Sara Shepard.
Publication date: June 30, 2009.
Pages: 336.
The girls discover that the person they think is Alison's murderer has actually been framed and start to wonder if the new "A" really wants to threaten them or possibly help them figure out the mystery. Emily has sex with her new boyfriend whose mother finds out and banishes Emily from their house without Isaac knowing. Hanna and Kate compete for the affections of Aria's brother Mike while Aria falls in love with Jason DiLaurentis again. Spencer meets up with a woman she thinks is her real mother and attempts to move to New York. Ian, who the girls find to be alive, reveals some secrets about Ali's disappearance. When the woods behind Spencer's house catches fire Aria barely escapes along with a girl whom the others recognize as Ali.