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.

In a place and time unknown, two elderly sisters live in a walled garden, secluded from the outside world. Evelyn and Lily have only ever known each other. What was before the garden, they have forgotten; what lies beyond it, they do not know. Each day is spent in languid service to their home: tending the bees, planting the crops, and dutifully following the instructions of the almanac written by their mother. So when a nameless boy is found hiding in the boarded house at the center of their isolated grounds, their once solitary lives are irrevocably disrupted.

On a bright spring afternoon, Ciara Fay makes a split-second decision that will change everything. Grabbing an armful of clothes off the clothesline, she straps her two young daughters into her car and drives away. Head spinning, all she knows for certain is that home is no longer safe—and that this time, when she leaves, she must stay away. On the surface, she has a perfect life: her husband, Ryan, is a good provider, sometimes even kind and attentive, from a nice Irish family, and they have another baby on the way.

After three grievous losses, Puritan woman Silence Marsh dares to question God aloud in the church, and that blasphemy lands her in trouble—she is silenced for a year by the powers that be. Broken in heart and spirit, Silence learns to mime and sign, but it isn't until a new Boston doctor, the dashing Daniel Greenleaf, comes to her backward Cape Cod village that she begins to hope again. Rather than treating Silence with bleeding or leeches, Dr. Greenleaf prescribes fresh air, St. John's Wort, long walks—and reading.

Reyna Darragh despises the scheming ways of the fae courts—she'd rather be on the battlefield. But as the daughter of a High King, her hand in marriage can end the war faster than her sword. So, with her realm in tatters, she agrees to marry her enemy, Prince Thane. The very same prince who killed hundreds of her kind during the war. Reyna has a far greater scheme in mind. To save her kingdom from the vicious prince, she plans to marry him, make him king, and then murder him so that she can take the throne herself. But as she grows closer to securing the crown, traitorous desire stirs.