Pretty Little Liars: Original Sin : Episode 4

In 1999, a group of friends is rocked by the sudden death of one of their own. Twenty-two years later, their daughters are pushed together by a mysterious foe.

As Imogen and her newfound friends plot revenge against a mutual nemesis, Karen and her twin sister Kelly hatch an insidious plan of their own.

In the wake of Spirit Week, Imogen unearths long-buried truths on her path to unmask the mysterious “A.” After Sheriff Beasley closes in, Noa, Faran, and Mouse weigh their options, while Tabby works to recover vital evidence.

Desperate to keep her mother’s house, Imogen throws a Halloween party to raise cash.

As Imogen and Tabby dig into the mystery surrounding Angela Waters, Faran deals with the scars of her past. After Shawn confronts Marjorie, Noa questions her relationship with her mother, while Mouse spots a familiar face on her first date.

As the Millwood carnival approaches, Mouse and Tabby each struggle with secrets, and Noa notices Shawn isn’t himself. Meanwhile, Imogen considers her baby’s future, and Faran confronts everything that’s been plaguing her.

The friends work together to uncover Imogen and Tabby’s assailant during the Annual Thanksgiving Millwood High Blood Drive. Later, Sidney confronts Tabby about her secrets.

Despite coming clean about “A,” the friends find their troubles are far from over – especially as the results of the group’s clandestine blood drive push Tabby towards a new suspect.

As “A” doubles down, the friends must work quickly to uncover the link between Angela Waters’ death, their mothers, and their mysterious foe… before it’s too late.

The PLLs await the results of A's trial and a much-needed break – only to be cursed with a fate worse than death ... summer school.

Heeding Dr. Sullivan's advice, the PLLs make the most of their summers. Meanwhile, Imogen forges a new identity away from her closest friends.

As the PLLs plan Mouse's surprise sixteenth birthday party, Tabby and Imogen face boy problems, Noa clashes with Jen and Faran spills her secret.

Still shaken from her encounter with Bloody Rose, Mouse searches for the real Rose Waters. Meanwhile, Imogen keeps tabs on Dr. Sullivan, Tabby works on a new short, Noa takes a much-needed day off, and Faran’s strength is put to the ultimate test.

A disturbing discovery causes the PLLs to doubt Dr. Sullivan. Meanwhile, during Tabby's movie marathon, Noa is forced to make a brutal decision.

After discovering that Kelly's church is using her former home for their disturbing "Hell House", Imogen springs into action, while Mouse and Ash plan a Pride pool party in protest. Later, the PLLs' plan to freak out the faithful takes a frightening turn.

Still shaken from Hell House, Imogen learns about Dr. Sullivan's secret ties to A, while the PLLs set out to uncover Bloody Rose's identity.

The PLLs take a final stab at their list of suspects, and through a harrowing night will discover the identity of Bloody Rose Waters once and for all.