One year after the notes from "A" stopped, high school seniors Aria, Spencer, Hanna, and Emily have even more twisted secrets to keep. Aria struggles with jealousy, Spencer crushes on her future stepbrother, Hanna tries not to ruin her father's Senate campaign, and Emily fights for a swim scholarship. But it's the deadly secret the girls are hiding from their spring break in Jamaica that could finally expose them all as pretty little liars.