Pretty Little Liars

Sara Shepard's novel, Pretty Little Liars, is the first book of a series. I greatly enjoyed reading this book. It is based in a small rich town called Rosewood Day. The main characters are five girls who are the best of friends. Suddenly, out of the blue, one of the girls named Alison goes missing. Now the police are on a huge search for where she could be. Is she dead? That is the question that haunts each of the girls every day. When the girls start receiving texts signed "A" from an unknown number, they begin to wonder if Ali really might still be alive. Then, their worst fears are confirmed. Ali's body is found. The police question the girls on anything, and everything they know. The only problem is, the things that they know that might help, they cant tell because this information could be quite self incriminating. Now its up to the girls to figure out who did it since they cant give the police any information on their dark secrets. Who is "A" if Ali is dead? Did "A" kill Ali? If not, then who did?