A student decides to fight back with a paper chain of 6 million links commemorating the victims of the Holocaust, and soon the whole school and half the internet are on board. Meanwhile, Link, perpetrator of many pranks and the most popular guy in the seventh grade, is shocked to learn he's actually Jewish.

World War I stretches its cruel fingers across Europe, where five young people, each from different backgrounds and nations, face the terror of battle, the deprivations of hunger, and all the awful challenges of war.

Felix, from Austria-Hungary, longs for the bravery to resist Jewish deportations before his own family can be taken.

Kara, from Britain, dreams of someday earning her Red Cross pin and working as a nurse -- or even a doctor.

Libby comes from a long line of bullies. She wants to be different, but sometimes that doesn’t work out. To bolster herself, she makes a card with the message You are amazing. That card sets off a chain reaction that ends up making a difference in the lives of some kids who could also use a boost—be it from dealing with bullies, unaccepting families, or the hole that grief leaves. Receiving an encouraging message helps each kid summon up the thing they need most, whether it’s bravery, empathy, or understanding.

As World War II comes to a close, the United States and the Soviet Union emerge as the two greatest world powers on extreme opposites of the political spectrum. After the United States showed its hand with the atomic bomb in Hiroshima, the Soviets refuse to be left behind. With communism sweeping the globe, the two nations begin a neck-and-neck competition to build even more destructive bombs and conquer the Space Race. In their battle for dominance, spy planes fly above, armed submarines swim deep below, and undercover agents meet in the dead of night.

Thirteen-year-old Eddie needs to do a community service project in preparation for his bar mitzvah. Against his better judgment, he ends up with a volunteering gig at Silver Brook Pavilion retirement home, where the residents call him "Eddie Whatever" rather than worry about remembering his last name. These old folks soon upend all Eddie's assumptions about the boringness of the elderly. There's a dramatic courtship unfolding, long-hidden secret identities, a rumor of a vengeful ghost, and a thief on the loose.

“I don’t remember. Tell me everything, Pepito. Tell me about Cuba.”

When the failed Bay of Pigs invasion in 1961 solidifies Castro’s power in Cuba, twelve-year-old Cumba’s family makes the difficult decision to send him to Florida alone. Faced with the prospect of living in another country by himself, Cumba tries to remember the sound of his father’s clarinet, the smell of his mother’s lavender perfume.

There are zero reasons for Theo Ripley to look forward to his family vacation. Not only are he, sister Laura, and nature-obsessed Dad going to Big Bend, the least popular National Park, but once there, the family will be camping. And Theo is an indoor animal. It doesn’t help that this will be the first vacation they’re taking since Mom passed away.

Ahmed Aziz is having an epic year—epically bad.

After his dad gets sick, the family moves from Hawaii to Minnesota for his dad’s treatment. Even though his dad grew up there, Ahmed can’t imagine a worse place to live. He’s one of the only brown kids in his school. And as a proud slacker, Ahmed doesn’t want to deal with expectations from his new teachers.

Twelve-year-old Jolene spends every day she can at the library watching her favorite livestream: The Desert Aviator, where twelve-year-old “Addie Earhart” shares her adventures flying an ultralight plane over the desert. While watching this daring girl fly through the sky, Jolene can dream of what it would be like to fly with her, far away from her own troubled home life where her mother struggles with a narcotic addiction. And Addie, who is grieving the loss of her father, finds solace in her online conversations with Jolene, her biggest—and only—fan.

Eleven-year-old Rigel Harman loves her life in off-the-grid Alaska. She hunts rabbits, takes correspondence classes through the mail, and plays dominoes with her family in their two-room cabin. She doesn’t mind not having electricity or running water—instead, she’s got tall trees, fresh streams, and endless sky.