Minutes after the principal of Opportunity High School in Alabama finishes her speech welcoming the student body to a new semester, they discover that the auditorium doors will not open and someone starts shooting as four teens, each with a personal reason to fear the shooter, tell the tale from separate perspectives.

Five months ago, Liv's big brother, Jonah, shot himself. It was an accident. He didn't know that the gun was loaded. But the damage was done. Now he won't ever be leaving their small mill town like he planned. Jonah can't speak, can't walk, can't take care of himself at all. Their house is full of machines and nurses working around the clock to keep Jonah alive. Liv's mom is struggling to cope with the aftermath, so Liv ends up being the one to soothe...

"Chloe didn't think about it much when she nodded off in study hall on that sleepy summer day. But when she wakes up, snow is on the ground and she can't remember the last six months of her life. Before, she'd been a mediocre student. Now, she's on track for valedictorian and being recruited by Ivy League schools. Before, she never had a chance with super jock Blake. Now he's her boyfriend. Before, she and Maggie were inseparable. Now her best friend...

"Sadie Wen is perfect on paper: school captain, valedictorian, and a 'pleasure to have in class.' It's not easy, but she has a trick to keep her model-student smile plastered on her face at all times: she channels all her frustrations into her email drafts. She'd never send them of course--she'd rather die than hurt anyone's feelings--but it's a relief to let loose on her power-hungry English teacher or a freeloading classmate taking credit for Sadie's...

Seventeen-year-old Greg has managed to become part of every social group at his Pittsburgh high school without having any friends, but his life changes when his mother forces him to befriend Rachel, a girl he once knew in Hebrew school who has leukemia.

Jacob Freisten, often in a fog, tries to ease through high school unnoticed; but a beautiful classmate takes notice of him and his life begins to change.

The stalker's identity has finally been revealed, but Spencer, Emily, Hanna and Aria are bound to repeat the past, and continue to be bad.

Although she has recently completed a 400-page romance novel, Princess Mia, in her last month of high school, has yet to pick a college, find a prom dress, or decide if her boyfriend J. P. is really The One.

When high school senior Piper Woods finds a notebook with mutilated photographs and a list of student sins, she is sure the book is too gruesome to be true, but when a student from the list dies, and although everyone thinks it is a suicide, she suspects something much worse, and her fears are confirmed when she receives an anonymous text daring her to make things right.

Former best friends Hanna, Aria, Spencer, and Emily, who lost their best friend and leader, Alison, years ago when she disappeared, find themselves in grave danger when they pursue the truth about Alison.