Everyone's dying to know the truth ...When Aerin Kelly was eleven, she idolised her seventeen-year-old sister, Helena, and they did everything together. They made Claymation movies and posted them to YouTube. They made fun of Windmere-Carruthers, the private school they attended, they invented new flavours for their parents' organic ice cream shop, and they dressed up their golden retriever, Buster. But when Helena went into senior year things started to change. Rather than being Aerin's inseparable sister, she started to push her away. Then, on a snowy winter's day, Helena vanished. Four...

Aria, Emily, Spencer, Hanna and Alison have been best friends since school. But then Alison goes missing, and her body is never found. Three years later, the girls have moved on from her apparent death - but when they start to get messages from the mysterious 'A', old wounds are reopened.

In the exclusive town of Rosewood, Pennsylvania, where the sweetest smiles hide the darkest secrets, four pretty little liars - Spencer, Aria, Emily, and Hanna - are hiding secrets. But the most horrible secret of all is something so scandalous it could destroy their perfect little lives.

Spencer, Aria, Emily, Hanna & Alison were best friends when they were at school. Alison was the group's ringleader, the one who knew all their darkest secrets. So when Alison vanished one night, the other girls' grief was tinged with relief. But when Ali's body was later found the girls were forced to unearth some ugly memories.

Five best friends once shared everything - even their deepest, darkest secrets. Back then for Aria, Spencer, Hanna, and Emily it was a dream come true - until Alison, the most beautiful of them all, suddenly vanished. Now someone named A has turned their charmed lives into a living nightmare.

Hannah will stop at nothing to be Rosewood's queen bee. Spencer's digging up her family secrets. Emily can't stop thinking about her new boyfriend. And Aria approves a little too strongly of her mom's taste in men.

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.

Four gorgeous girls are telling very ugly stories. First Emily, Aria, Hanna and Spencer claimed they found a body in the woods behind Spencer's house, only to have it vanish without a trace. Then, when the same woods went up in flames, they swore they saw someone who's supposed to be dead rise from the ashes.

Back in middle school, Ali plucked Emily, Hanna, Spencer and Aria from obscurity and turned them into the beautiful, popular girls everyone wanted to be. Ali was the best friend they ever had. But she also made them do terrible things and taunted them with their secrets. Now three years later, all their questions about Ali have been answered.

It's been a year since the torturous notes from A stopped and the mystery of Alison DiLaurentis's disappearance was finally put to rest. Now seniors in high school, Aria, Spencer, Hanna, and Emily are older, but they're not any wiser. The pretty little liars have more secrets than ever.