Spoilers for Pretty Little Liars: Original Sin Bosses

A character is killed off in the middle of a dance in Pretty Little Liars: Original Sin, and an incredibly terrifying A is introduced

After a tragic death at a rave twenty-two years ago, the daughters of those in attendance find themselves dealing

The letter is discovered in blood next to Imogen's mother's body, and then A stalks her, Tabby (Chandler Kinney), Noa (Maia Reficco), Mouse (Malia Pyles), and Faran (Zaria)

They all wind up in detention, which he blames on Karen (Mallory Bechtel), resulting in retaliation from them

As a result, Karen and her twin Kelly plan to get the girls back to the dance, specifically Imogen

Karen is pushed to death by A before she can re-enact Carrie

In the first three episodes, you get to know the whole story, which is why those episodes drop together