After Alison's disappearance a year earlier, the Pretty Little Liars start receiving anonymous messages from someone named "A" who threatens to expose their darkest secrets. As the girls try to figure out who is behind these messages, they begin to unearth long-buried truths and face danger that threatens their lives. They must work together to unravel the mystery of Alison's disappearance and unmask the identity of "A" before it's too late.
Over the course of the show, the Liars delve deeper into the complex secrets and drama within their own lives and their relationships with their respective love interests, friends, and family members. Through twists, turns, and unexpected alliances, "Pretty Little Liars" weaves a thrilling web of mystery, suspense, and friendship as the girls confront their pasts, embrace their strengths, and confront the forces that have been haunting them from the beginning.