10:00 a.m. The principal of Opportunity, Alabama's high school finishes her speech, welcoming the entire student body to a new semester and encouraging them to excel and achieve. 10:02 a.m. The students get up to leave the auditorium for their next class. 10:03. The auditorium doors won't open. 10:05. Someone starts shooting. Told over the span of 54 harrowing minutes from four different perspectives, terror reigns as one student's calculated revenge turns into the ultimate game of survival.

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.

Ellingham Academy is a famous private school in Vermont for the brightest thinkers, inventors, and artists. It was founded by Albert Ellingham, an early 20th century tycoon, who wanted to make a wonderful place full of riddles, twisting pathways, and gardens. "A place", he said, "where learning is a game." Shortly after the school opened, his wife and daughter were kidnapped. The only real clue was a mocking riddle listing methods of murder, signed with the frightening pseudonym "Truly, Devious".

Ciara and Oliver meet in a supermarket queue in Dublin and start dating the same week COVID-19 reaches Irish shores. When lockdown threatens to keep them apart, Oliver suggests they move in together. Ciara sees a unique opportunity for a relationship to flourish without the scrutiny of family and friends. Oliver sees a chance to hide who - and what - he really is.

December is the time of the annual Ceremony at which each twelve-year-old receives a life assignment determined by the Elders. Jonas watches his friend Fiona named Caretaker of the Old and his cheerful pal Asher labeled the Assistant Director of Recreation. But Jonas has been chosen for something special. When his selection leads him to an unnamed man, the man called only the Giver, he begins to sense the dark secrets that underlie the fragile perfection of his world.

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.

Lucky Armstrong is a tough, talented grifter who has just pulled off a million-dollar heist with her boyfriend, Cary. She’s ready to start a brand-new life, with a new identity - when things go sideways. Lucky finds herself alone for the first time, navigating the world without the help of either her father or her boyfriend, the two figures from whom she’s learned the art of the scam. When she discovers that a lottery ticket she bought on a whim is worth millions, her elation is tempered by one big problem: Cashing in the winning ticket means she’ll be arrested for her crimes.

Ivy, Mateo, and Cal used to be close. Now all they have in common is Carlton High and the beginning of a very bad day. So when the three unexpectedly run into each other, they decide to avoid their problems by ditching. Just the three of them, like old times. Except they’ve barely left the parking lot before they run out of things to say...until they spot another Carlton High student skipping school - and follow him to the scene of his own murder. In one chance move, their day turns from dull to deadly. And it’s about to get worse.

A ton of copycat gossip apps have popped up since Simon died, but in the year since the Bayview four were cleared of his shocking death, no one's been able to fill the gossip void quite like he could. The problem is no one has the facts. Until now. This time it's not an app, though - it's a game. Truth or Dare. Phoebe's the first target. If you choose not to play, it's a truth. And hers is dark. Then comes Maeve, and she should know better - always choose the dare. But by the time Knox is about to be tagged, things have gotten dangerous.

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.

Valentine Layton, the Duke of Malvern, has twin problems: literally. It was always his father’s hope that Valentine would marry Miss Arabella Tarleton. But, unfortunately, too many novels at an impressionable age have caused her to grow up...romantic. So romantic that a marriage of convenience will not do and after Valentine’s proposal she flees into the night determined never to set eyes on him again. Arabella’s twin brother, Mr. Bonaventure “Bonny” Tarleton, has also grown up...romantic. And fully expects Valentine to ride out after Arabella.

Pip is about to head to college, but she is still haunted by the way her last investigation ended. She’s used to online death threats in the wake of her viral true-crime podcast, but she can’t help noticing an anonymous person who keeps asking her: Who will look for you when you’re the one who disappears? 

Suzette knows her clever and manipulative seven-year-old daughter doesn’t love her. She can see the hatred and jealousy in her eyes. And as Hanna’s subtle acts of cruelty threaten to tear her and her husband apart, Suzette fears her very life may be in grave danger....

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.

Fifteen-year-old Jeff wakes up on New Year's Day to find himself in the hospital. Make that the psychiatric ward. With the nut jobs. Clearly, this is all a huge mistake. Forget about the bandages on his wrists and the notes on his chart. Forget about his problems with his best friend, Allie, and her boyfriend, Burke. Jeff's perfectly fine, perfectly normal, not like the other kids in the hospital with him. Now they've got problems.