Five months ago, Valerie Leftman's boyfriend, Nick, opened fire on their school cafeteria. Shot trying to stop him, Valerie inadvertently saved the life of a classmate, but was implicated in the shootings because of the list she helped create. A list of people and things she and Nick hated. The list he used to pick his targets. Now, after a summer of seclusion, Val is forced to confront her guilt as she returns to school to complete her senior year.

Charlotte Davis is in pieces. At 17 she's already lost more than most people do in a lifetime. But she's learned how to forget. The broken glass washes away the sorrow until there is nothing but calm. You don't have to think about your father and the river. Your best friend, who is gone forever. Or your mother, who has nothing left to give you. Every new scar hardens Charlie's heart just a little more, yet it still hurts so much. It hurts enough to not care anymore, which is sometimes what has to happen before you can find your way back from the edge.

On September 5, a little after midnight, Death-Cast calls Mateo Torrez and Rufus Emeterio to give them some bad news: They're going to die today. Mateo and Rufus are total strangers, but, for different reasons, they're both looking to make a new friend on their End Day. The good news: There's an app for that. It's called The Last Friend, and through it Rufus and Mateo are about to meet up for one last great adventure - to live a lifetime in a single day.

The Hope Juvenile Treatment Center is ironically named. No one has hope for the delinquent teenagers who have been exiled there; the world barely acknowledges that they exist. Then the guards at Hope start acting strange. And one day...they don't show up. But when the teens band together to make a break from the facility, they encounter soldiers outside the gates.

Eden was always good at being good. Starting high school didn't change who she was. But the night her brother's best friend rapes her, Eden's world capsizes. What was once simple is now complex. What Eden once loved - who she once loved - she now hates. What she thought she knew to be true is now lies. Nothing makes sense anymore, and she knows she's supposed to tell someone what happened, but she can't. So she buries it instead. And she buries the way she used to be.

Lily hasn't always had it easy, but that's never stopped her from working hard for the life she wants. She's come a long way from the small town in Maine where she grew up - she graduated from college, moved to Boston, and started her own business. So when she feels a spark with a gorgeous neurosurgeon named Ryle Kincaid, everything in Lily's life suddenly seems almost too good to be true.

Samantha McAllister looks just like the rest of the popular girls in her junior class. But hidden beneath the straightened hair and expertly applied makeup is a secret that her friends would never understand: Sam has purely obsessional OCD and is consumed by a stream of dark thoughts and worries that she can't turn off. Second-guessing every move, thought, and word makes daily life a struggle, and it doesn't help that her lifelong friends will turn toxic at the first sign of a wrong outfit, wrong lunch, or wrong crush.

Pay close attention, and you might solve this. On Monday afternoon five students at Bayview High walk into detention. Bronwyn, the brain, is Yale-bound and never breaks a rule. Addy, the beauty, is the picture-perfect homecoming princess. Nate, the criminal, is already on probation for dealing. Cooper, the athlete, is the all-star baseball pitcher. And Simon, the outcast, is the creator of Bayview High's notorious gossip app. Only Simon never makes it out of that classroom. Before the end of detention, Simon's dead.

Aza Holmes never intended to pursue the disappearance of fugitive billionaire Russell Pickett, but there’s a hundred-thousand-dollar reward at stake and her Best and Most Fearless Friend, Daisy, is eager to investigate. So together, they navigate the short distance and broad divides that separate them from Pickett’s son Davis. Aza is trying. She is trying to be a good daughter, a good friend, a good student, and maybe even a good detective, while also living within the ever-tightening spiral of her own thoughts.

Pip is not a detective anymore. With the help of Ravi Singh, she released a true-crime podcast about the murder case they solved together last year. The podcast has gone viral, yet Pip insists her investigating days are behind her. But she will have to break that promise when someone she knows goes missing. Jamie Reynolds has disappeared, on the very same night the town hosted a memorial for the sixth-year anniversary of the deaths of Andie Bell and Sal Singh.

Clay Jensen returns home from school to find a strange package with his name on it lying on his porch. Inside he discovers several cassette tapes recorded by Hannah Baker, his classmate and crush, who committed suicide two weeks earlier. Hannah's voice explains that there are 13 reasons she decided to end her life. Clay is one of them. If he listens, he'll find out why.

Sterling is an ordinary New Hampshire town where nothing ever happens - until the day its complacency is shattered by an act of violence. Josie Cormier, the teenage daughter of the judge sitting on the case, should be the state's best witness, but she can't remember what happened before her very own eyes - or can she? As the trial progresses, fault lines between the high school and the adult community begin to show - destroying the closest of friendships and families.

In a single moment, everything changes. Seventeen year-old Mia has no memory of the accident; she can only recall riding along the snow-wet Oregon road with her family. Then, in a blink, she finds herself watching as her own damaged body is taken from the wreck.

From her first moment at Merryweather High, Melinda Sordino knows she's an outcast. She busted an end-of-summer party by calling the cops, a major infraction in high-school society, so her old friends won't talk to her, and people she doesn't know glare at her. She retreats into her head, where the lies and hypocrisies of high school stand in stark relief to her own silence, making her all the more mute.

Avery Grambs has a plan for a better future: Survive high school, win a scholarship, and get out. But her fortunes change in an instant when billionaire Tobias Hawthorne dies and leaves Avery virtually his entire fortune. The catch? Avery has no idea why - or even who Tobias Hawthorne is. To receive her inheritance, Avery must move into sprawling, secret passage-filled Hawthorne House, where every room bears the old man's touch - and his love of puzzles, riddles, and codes.