Killer: a pretty little liars novel by Sara Shepard
Sara Shepard keeps the suspense going in the fifth book in the Pretty Little Liars series. Hanna, Aria, Emily, and Spencer think that "A" is finally gone for good. Ian's been arrested for the murder of Ali and now life can go back to normal. That's what they thought but the girls quickly realize that "A" is still around. But this time she seems to be helping the girls instead of tormenting them. With "A" you never know. The mystery of who killed Ali is far from over. Check out the first four books in the series if you haven't already.
Pretty Little Liars
Flawless: a pretty little liars novel
Perfect: a pretty little liars novel
Unbelievable:a pretty little liars novel
Killer: a pretty little liars novel