After their cousin Poppy jumps to her death, the remaining heiresses of the Saybrook family receive an ominous warning that forces them to uncover a dark truth about their family before they lose the only thing money can't buy--their lives.

Tired of being blackmailed by a stalker who is tormenting them with threats of revealing their darkest secrets and biggest mistakes, high school seniors Aria, Emily, Hanna, and Spencer team up to fight back.

After surviving their latest encounter with A, high school seniors Aria, Emily, Spencer, and Hanna must try to convince the police that the real A is still on the loose, all while trying to stay alive.

Forging a friendship based on their mutual hatred of a philandering boy, five girls imagine a perfect way to kill him and must prove their innocence when he is killed in the exact manner they envisioned.

When one of their tightly-knit group mysteriously disappears, four high school girls find their friendship difficult to maintain when they begin receiving taunting messages from someone who seems to know everything about their past and present secrets.

After their friend Alison, missing for more than three years, turns up dead, four former best friends, each of whom had a secret known only by Alison, begin receiving frightening messages from someone identified by the letter "A."