Turtle is scavenging a drowned town when she saves a stranger’s life. There’s something special about Kai—an attraction she’s never felt before. She would do anything to see him again. But Turtle can never truly be with Kai, because Kai is Normal, and Turtle is one of the Mer, kids whose genes were illegally hacked before birth and who now have working gills as well as lungs. Turtle lives on an old cruise ship with the other Mer in order to be close to the water she needs to survive.

There's a shortage of men in the kingdom of Amarra. After a failed rebellion against the matriarchy, most noblemen in the country are dead. Now the women of Amarra must obtain their husbands (should they want one) by kidnapping them from other kingdoms. Olerra, a warrior princess vying for the throne, is determined to prove her worth by kidnapping a husband. And not just any husband. To outmaneuver her treacherous cousin, she needs the best. Fortunately, the second-born prince of their greatest enemy is widely known for both his looks and his sweet, docile temperament.

In 1940s Germany, Sophie is excited to discover a message waiting for her in the Bridegroom's Oak from a mysterious suitor. Meanwhile, her best friend, Hanna, is sending messages too—but not to find love. As World War II unfolds in their small town of Kleinwald, the oak may hold the key to resistance against the Nazis.

Monica Tsai spends most days on her computer, journaling the details of her ordinary life and coding for a program that seeks to connect strangers online. A self-proclaimed recluse, she's always struggled to make friends and, as a college freshman, finds herself escaping into a digital world, counting the days until she can return home to her beloved grandparents. They are now in their nineties, and Monica worries about them constantly—especially her grandmother, Yun, who survived two wars in China before coming to the States, and whose memory has begun to fade.

Seven years ago, Maeve Abenthy lost everything: her world, her father, even her name. Desperate to escape the stain of her father’s crimes, she lives under a fake name, never staying in one place long enough to put down roots. Then she receives a mysterious letter with four impossible words: Your father was innocent. To uncover the truth, she poses as an apprentice for the Otherwhere Post, where she’ll be trained in the art of scriptomancy—the dangerous magic that allows couriers to enchant letters and deliver them to other worlds.