Juni lives in a world without books. The Blight killed off all the trees, and since then, paper is worth more than just about anything else. Juni’s parents were killed in an archeological dig when she was young, so now it’s just her and her Grandpa Edgar, trying to survive. When she’s not in school, Juni and her friends Doler and Quaze turn to plifting—scavenging in abandoned buildings for any scrap of paper they can find—to earn a little money. If Juni can find enough paper, she can pay for the expensive health care Grandpa needs.

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.

Starting high school brings big changes for Immie and Jack, who’ve been everything to each other ever since Jack crashed his skateboard into Immie’s yard when they were seven years old. All of a sudden, a game-winning goal catapults Jack into star status with the soccer team, and Immie is meeting new girl friends whose questions are making her wonder about the identity of her father for the first time in her life.

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.

Yash is the best athlete at Robinette Middle School—so good, in fact, that he’s already playing on the high school’s JV sports teams. Imagine his shock when he learns that his JV practices have kept him from earning a state-mandated credit for eighth-grade PE. To graduate, he has to take Physical Education Equivalency—PEE, also known as “Slugfest”—in summer school.