Killer

Killer is the sixth book in the series Pretty Little Liars by Sara Shepard, which was published on June 30th, 2009 by HarperTeen.

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 just to solve the mystery. Emily has sex with her new boyfriend Isaac, 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 reveals some secrets about Ali's disappearance. Aria appears with a girl whom the others recognize as Ali.