Pretty Little Liars (2010)

A clique of teenage girls drift apart after the group's leader, Alison DiLaurentis, goes missing. Her body is found and the girls are reunited at her funeral. All four begin receiving text messages from the mysterious 'A', who seems to know many of the group's deepest secrets, some of which only the late Alison had knowledge of. The girls join forces against A's scheming and try to uncover the mystery of Alison's death.