1938. Gillian Larking, lonely and away at boarding school, is used to going unnoticed. But then she meets Violet Claybourne, her vibrant roommate who takes Gilly under her wing. Violet is unlike anyone Gilly has ever met, and she regales Gilly with tales of her grand family estate and her two elegant sisters. Gilly is soon entranced by stories of the Claybournes, so when Violet invites Gilly to meet her family at Thornleigh Hall, she can't believe her luck. But Gilly soon finds that behind the grand façade of Thornleigh Hall, darkness lurks.

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.

Saint-Malo, Brittany, 1758. To Lucinde Leon, the youngest daughter of a wealthy French shipowner, the high walls of Saint-Malo are more hindrance than haven. While her sisters are busy trying to secure advantageous marriages, Luce spends her days secretly being taught to sail by Samuel, her best friend—and an English smuggler. Only he understands how the waves call to her. Then one stormy morning, Luce rescues a drowning man from the sea.

Once upon a time, among the bloodred trees of Thirstwood, a young forest princess became friends with a lonely boy from underground. He gifted her an amber ring, a worthless trinket—or so he thought—because no sooner did he slide it onto her finger than the queen of the underground and the forest king declared war. Years later, Cassia is a crucial force in her father’s army, wielding her ring of light that can blind and disorient hundreds of demons at a time. Then battle-hardened Zeru abducts her, planning to steal the ring back to fix his costly childhood mistake.

Evelyn can remember all her past lives. She can also remember that in every single one, she’s been murdered before her eighteenth birthday by Arden, a supernatural being linked to her soul. The problem is that she’s quite fond of the life she’s in now, and her little sister needs her in order to stay alive. If Evelyn wants to save her sister, she’ll have to find the centuries-old devil who hunts her through each life before they find her first, figure out why she’s being hunted and finally break their curse, and try not to fall in love . . . again.