Flawless is the second book in the series, “Pretty Little Liars”. The story is about 4 high school girls from Rosewood who are all haunted by an unknown stalker, who is called A.The four girls are Aria Montgomery, Spencer Hastings, Hanna Marin, and Emily Fields. Years ago, their close friend Alison Dilaurentis mysteriously disappears. The secrets that these girls share with Alison, are forgotten about. But years later, A comes and threatens to tell their secrets to everyone.