Tonight, Riverview Theaters is closing forever, the last remaining business in a defunct shopping mall. The moviegoers have left, and Jo and her six coworkers have the final shift, a shift that quickly takes a dark turn. First a stranger arrives with a chilling accusation. Then the power goes out and their manager disappears, along with the keys to the lobby doors and the theater safe, where the crew's phones are locked each shift. The crew's tension turns to terror when Jo discovers the dead body of one of her co-workers.

On her 18th birthday, Cleo receives a mysterious invitation to a scavenger hunt. She's sure her best friend, Hope, or her brother, Connor, is behind it, but no one confesses. And as Cleo and Hope embark on the hunt, the seemingly random locations and clues begin to feel familiar. In fact, all of the clues seem to be about Cleo's dead boyfriend, Declan, who drowned on a group rafting trip exactly a year ago: a bracelet she bought him, a song he loved, a photo of the rafting group, taken just before Declan drowned.

Theo's always been impulsive. But telling Paige how he feels? He's obsessed over that decision. And it's time. Tonight. At the party on the riverbank, under the old walking bridge, site of so many tales of love and death. Paige has had a crush on Theo since they first met, but she knows her feelings are one-sided. She's trying to move on, to flirt. A party at the river is just what she needs. Except a fight breaks out, and when Paige tries to intervene - Theo's fist lands in her face.  

Twelve-year-old Lidia is outside her grandfather's house when planes fly overhead, bearing the Nazi cross on each wing. Before the bombs hit the ground, Lidia realizes her life is about to change forever. Poland has fallen under German occupation, and her father makes the brave decision to join the Polish army to fight against the Nazis. Lidia wants to follow him into war, but she's far too young, and she's needed by her mother and brother. After her family returns to Warsaw, Lidia continues to play the piano, but she also wants to aid the Jewish people held captive in the Warsaw Ghetto.

December 6, 1941: Best friends Frank and Stanley have it good. Their dads are Navy pilots stationed at Pearl Harbor in Hawaii, and the boys get a front-row view of the huge battleships and the sparkling water. Yes, World War II is raging in Europe and in Asia, but the US isn't involved in the war, and the boys are free to dream about becoming comic book creators. They've even invented a superhero of their own, in the style of Batman, Superman, Captain America, and other stars of the Golden Age of Comics. December 7th, 1941: Everything explodes.

Simon O'Keeffe's biggest claim to fame should be the time his dad accidentally gave a squirrel a holy sacrament. Or maybe the alpaca disaster that went viral on YouTube. But the story the whole world wants to tell about Simon is the one he'd do anything to forget: the story in which he's the only kid in his class who survived a school shooting. Two years after the infamous event, twelve-year-old Simon and his family move to the National Quiet Zone—the only place in America where the internet is banned.

"You are to report to Station X at Bletchley Park, Buckinghamshire, in four days time....That is all you need to know." This was the terse telegram hundreds of young women throughout the British Isles received in the spring of 1941, as World War II raged. As they arrived at Station X, a sprawling mansion in a state of disrepair surrounded by Spartan-looking huts with little chimneys coughing out thick smoke—these young people had no idea what kind of work they were stepping into. Who had recommended them? Why had they been chosen? Most would never learn all the answers to these questions.

Dani and Eric have been best friends since Dani moved next door in second grade. They bond over donuts, comic books, and camping on the Cape. Until one summer when everything changes. Did Eric cause the accident that leaves Dani unable to do the one thing in the world she most cares about? The question plagues him, and he will do anything to get answers about the explosion that injured her. But Dani is hurting too much to want Eric to pursue the truth—she just wants to shut him out and move on. Besides, Eric has a history of dropping things he starts. 

It's 1947, and India, newly independent of British rule, has been separated into two countries: Pakistan and India. The divide has created much tension between Hindus and Muslims, and hundreds of thousands are killed crossing borders. Half-Muslim, half-Hindu twelve-year-old Nisha doesn't know where she belongs or what her country is anymore. When Papa decides it's too dangerous to stay in what is now Pakistan, Nisha and her family become refugees and embark first by train but later on foot to reach her new home.

At the elite West Archer Academy, all the students are gifted, but four are exceptional. Though the Evers look twelve, they're actually centuries old, possessing knowledge and talents that make them extraordinary. And boarding school is the perfect cover for their brilliance—and their secret.