When Anna meets a stock trader, she thinks he's perfect, but her identical twin sister Zoe doesn't trust him, so she sets out to discover the truth about him.

In Beacon Heights, a seemingly perfect town, a group of three college friends struggle with the stress of being overachievers. In the aftermath of the town’s first murder, each Perfectionist hides behind a secret, a lie and an alibi.

Four girls sink a time capsule in a lake with a list of things they want to do before graduation, but they all go separate ways before graduating. When a tragedy strikes, they reunite to find the capsule and complete the bucket list.

Based on the Pretty Little Liars series of young adult novels by Sara Shepard, the series follows the lives of four girls — Spencer, Hanna, Aria, and Emily — whose clique falls apart after the disappearance of their queen bee, Alison. One year later, they begin receiving messages from someone using the name "A" who threatens to expose their secrets — including long-hidden ones they thought only Alison knew.