Everything you need to understand or teach Pretty Little Liars #2 by Sara Shepard.
Flawless is the second novel in the Pretty Little Liars series. The book focuses on the lives of four girls--Hanna, Spencer, Aria, and Emily—who have just attended the funeral of their former best friend, Alison DiLaurentis. The police are investigating her death as a murder. Meanwhile, the four girls receive threatening messages from an anonymous stalker named A who seems to know everything about their past and present. The girls are afraid to go to the police because their past contains a dark secret that could put them all in jail. While the girls try to navigate their lives, the novel explores bullying, illusions, family, and the dangers of teenage girlhood.