Pretty Little Liars is an American dramatic televisión series. It was created por Marlene King, based on the popular novels written por Sasha Shepard.
Spencer,Emily,Aria and Hanna were very good friends of Alison. Alison was the former leader of this group, she alwasy tell the girls what to do. They kept secrets with her.
Once why the five girls were having a " Pijama Party" in Spencer´s house Alison disappearance. After this the four girls separeted.
One año later Alison´s disappearance Emily, Spencer, Hanna and Aria received messages from "A" telling secrets only Alison knew. The girls thought Alison may be alive but then later found her´s body buried in her house. "A" is alwasy looking what the girls do and send messages all the time.