Spencer Aria Emily Hanna & their best friend Alison were the most popular girls at Rosewood Day School. Alison was the group's ringleader the one who knew all their darkest secrets. So when Alison vanished one night Spencer Aria Emily & Hanna's grief was tinged with relief. But when Ali's body was later discovered in her own backyard the girls were forced to unearth some ugly memories of their old friend too. Is there more to Alison's death than anyone realises? Now someone named A someone who seems to know everything is pointing the finger for Ali's murder at one of them. & A is poised to ruin their perfect little lives.. .for ever.