It's been a year since A's messages stopped coming, and the mystery of Alison DiLaurentis's disappearance is finally behind her. Now seniors, Aria, Spencer, Hanna, and Emily are older, but no wiser. The Pretty Little Liars have even more secrets—tangled secrets that could destroy the perfect lives they've so carefully created again. Aria is jealous of her boyfriend's new exchange student. Spencer is getting a little too cozy with his soon-to-be stepbrother. One scandalous photo of Hannah and her father's Senate campaign would be ruined. And Emily is ready to do anything for a swimming scholarship. But the worst part is that during spring break in Jamaica, they did something unforgivable. The girls are desperately trying to forget that fateful night, but they should know better than anyone that all secrets eventually wash ashore...