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.