There is a Before and an After for sixth grader Bea Coughlin. Before the shooting at her school that took the lives of her classmates and teacher and After, when she must figure out how to grieve, live, and keep rolling forward. But as her community rallies in a tidal wave of marches and speeches and protests, Bea can’t get past the helplessness she felt in her wheelchair as others around her took cover.

Summer, 1940. Nineteen-year-old Jakob Novis and his quirky younger sister Lizzie share a love of riddles and puzzles. And now they’re living inside of one. The quarrelsome siblings find themselves amidst one of the greatest secrets of World War II—Britain’s eccentric codebreaking factory at Bletchley Park. As Jakob joins Bletchley’s top minds to crack the Nazi's Enigma cipher, fourteen-year-old Lizzie embarks on a mission to solve the mysterious disappearance of their mother.

It's August 1999. For twelve-year-old Michael Rosario, life at Fox Run Apartments in Red Knot, Delaware, is as ordinary as ever—except for the looming Y2K crisis and his overwhelming crush on his sixteen-year-old babysitter, Gibby. But when a disoriented teenage boy named Ridge appears out of nowhere, Michael discovers there is more to life than stockpiling supplies and pining over Gibby.

Seventh grade begins, and Kareem’s already fumbled it. His best friend moved away, he messed up his tryout for the football team, and because of his heritage, he was voluntold to show the new kid—a Syrian refugee with a thick and embarrassing accent—around school. Just when Kareem thinks his middle school life has imploded, the hotshot QB promises to get Kareem another tryout for the squad. There’s a catch: to secure that chance, Kareem must do something he knows is wrong.

Fern’s lived at the Ranch, an off-the-grid, sustainable community in upstate New York, since she was six. The work is hard, but Fern admires the Ranch's leader, Dr. Ben. So when Fern’s mother sneaks them away in the middle of the night and says Dr. Ben is dangerous, Fern doesn't believe it. She wants desperately to go back, but her mom just keeps driving. Suddenly thrust into the treacherous, toxic, outside world, Fern thinks only about how to get home again.