[S.I.] : HarperCollins, 2009.
#1 New York Times bestselling series The sixth book in the #1 New York Times bestselling series that inspired the hit ABC Family TV show Pretty Little Liars. Hanna, Aria, Spencer, and Emily have been lying ever since they became friends with beautiful Alison DiLaurentis. And their bad-girl ways didn't die with her. Hanna's on a mission to corrupt Rosewood's youth, starting with a very attractive sophomore. Aria's snooping into her boyfriend's past. Spencer's stealing—from her family. And pure little Emily's abstaining from abstinence. The girls should be careful, though. There's a new A in town turning up the heat. And this time Rosewood is going to burn. Full of unexpected twists and shocking revelations, Killer is the sixth book in New York Times bestselling author Sara Shepard's compelling Pretty Little Liars series.