Jennifer A. Nielsen, award-winning author of A Night Divided and Rescue, artfully weaves together the stories of five kids living through World War I, each of whom holds the key to the others' futures... if they are lucky -- and brave -- enough to find each other. 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.

Six hundred and fifty-seven days ago, Meg Kenyon's father left their home in France to fight for the Allies in World War II, and that was the last time Meg saw him. Recently, she heard he was being held prisoner by the Nazis, a terrible sentence from which Meg fears he'll never return. Suddenly, an impossible chance to save her father falls into Meg's lap. After following a trail of blood in the snow, Meggie finds an injured British spy hiding in her grandmother's barn.

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.

Chaya Lindner is a teenager living in Nazi-occupied Poland. Simply being Jewish places her in danger of being killed or sent to the camps. After her little sister is taken away, her younger brother disappears, and her parents all but give up hope, Chaya is determined to make a difference. Using forged papers and her fair features, Chaya becomes a courier and travels between the Jewish ghettos of Poland, smuggling food, papers, and even people. Soon Chaya joins a resistance cell that runs raids on the Nazis' supplies. But after a mission goes terribly wrong, Chaya's network shatters.

Danger is never far from Audra’s family farm in Lithuania. She always avoids the occupying Russian Cossack soldiers, who insist that everyone must become Russian - they have banned Lithuanian books, religion, culture, and even the language. But Audra knows her parents are involved in something secret and perilous. When Cossacks arrive abruptly at their door, Audra’s parents insist that she flee, taking with her an important package and instructions for where to deliver it. But escape means abandoning her parents to a terrible fate.

Twelve-year-old Atlas Wade has been trying to forget the memory of his mother by climbing mountains ever since she died when he was nine years old. When his father signs them up for an expedition group hoping to be the first to ever summit the unconquerable Mount Everest, Atlas can't wait for the chance to prove himself to his father, and maybe finally he can leave his mother behind him on the mountain. But this time, Atlas is the one left behind, as well as a young American girl named Maddie and their sturdy yet injured Sherpa, Chodak.

. With the rise of the Berlin Wall, 12-year-old Gerta finds her family divided overnight. She, her mother, and her brother, Fritz, live on the eastern side, controlled by the Soviets. Her father and middle brother, who had gone west in search of work, cannot return home. Gerta knows it is dangerous to watch the wall, to think forbidden thoughts of freedom, yet she can't help herself. She sees the East German soldiers with their guns trained on their own citizens; she, her family, her neighbors, and her friends are prisoners in their own city.

When Nic, a slave in the mines outside of Rome, is forced to enter a sealed cavern containing the lost treasures of Julius Caesar, he finds much more than gold and gemstones: He discovers an ancient bulla, an amulet that belonged to the great Caesar and is filled with a magic once reserved for the Gods - magic some Romans would kill for.

Oliver Zahn, spitball champion and self-declared rule-wrecker of Brightling Middle School, is not a fan of his new homeroom teacher, Mr. Aidact. The guy is sort of stiff, never cracks a smile, and refers to them as “pupils.” The worst part is he catches Oliver before he can pull any of his signature pranks! It’s time for Oliver and his best friend, Nathan, to show the new teacher who’s boss.

Hearts and loyalties collide in this electrifying new YA series from best-selling author Jennifer A. Nielsen. Nothing is as it seems in the kingdom of Antora. Kestra Dallisor has spent three years in exile in the Lava Fields, but that won't stop her from being drawn back into her father's palace politics. He's the right-hand man of the cruel king, Lord Endrick, which makes Kestra a valuable bargaining chip. A group of rebels knows this all too well - and they snatch Kestra from her carriage as she reluctantly travels home. But Kestra is not the obedient captive they expected.

Jake Rizzi is about to spend the summer at his great-aunt’s cabin in the mossy, sodden Oregon backwoods. His parents seem to need a break from him and his ADHD. He tries not to take it personally, but isn’t sure about his aunt’s off-the-grid lifestyle and strange stories about a turtle with a ruby-colored shell. Soon, Jake learns that the turtle is more than a myth. And thanks to a viral article online, strangers from all over the world have arrived to search for it--including a sinister animal poacher and towering twin zoologists from Sweden.

When twelve-year-old Maddie hatches a scheme for a secret sleepover with her two best friends, she ends up waking up to a nightmare. She’s alone—left behind in a town that has been mysteriously evacuated and abandoned. With no one to rely on, no power, and no working phone lines or internet access, Maddie slowly learns to survive on her own. Her only companions are a Rottweiler named George and all the books she can read. After a rough start, Maddie learns to trust her own ingenuity and invents clever ways to survive in a place that has been deserted and forgotten.

Hope Smith can't stand rich people—the dictionary magnate family the Wintertons most of all. Not since she and her twin brother, Gordon, learned that their dad was one. So when Gordon enters the family into the Winterton’s charity spelling bee, Hope wants nothing to do with it. But with their mom losing her job and the family facing eviction from the motel where they live, they desperately need the money, and it looks like Hope doesn’t have much of a choice.

Selah knows her rules for being normal. She always, always sticks to them. This means keeping her feelings locked tightly inside, despite the way they build up inside her as each school day goes on, so that she has to run to the bathroom and hide in the stall until she can calm down. So that she has to tear off her normal-person mask the second she gets home from school, and listen to her favorite pop song on repeat, trying to recharge.

Meet Resilience, a Mars rover determined to live up to his name. Res was built to explore Mars. He was not built to have human emotions. But as he learns new things from the NASA scientists who assemble him, he begins to develop humanlike feelings. Maybe there’s a problem with his programming…. Human emotions or not, launch day comes, and Res blasts off to Mars, accompanied by a friendly drone helicopter named Fly. But Res quickly discovers that Mars is a dangerous place filled with dust storms and giant cliffs.