Deciding to come clean about a terrible mistake they committed during spring break, high school seniors Aria, Emily, Hanna, and Spencer hope to end the blackmail of a ruthless stalker who retaliates by plotting a murderous revenge.

It's springtime in suburban Rosewood, which means iced soy lattes, fresh manicures in shimmering pastels, and prom. But while everyone else is flipping through the racks at Saks in search of the perfect dress, Hanna, Spencer, Emily, and Aria are on a different kind of hunt: They're looking for A... Hanna puts her campaign for prom queen on the back burner to volunteer at the burn clinic, where one of A's victims is recovering. Emily digs into Ali's...