Brittany, France. Archaeologist Ariadne Walker has never believed local legends of the lost underwater city of Ys or the story of the water witch: the princess of Ys who cursed her lover when he betrayed her. And when her fiancé Simon drowns, following a trail of treasure he believes leads to Ys, Ari’s whole life shatters. Walking alone on the cliffs with her grief, Ari is approached by a mysterious masked figure. But when the figure removes the mask, Ari’s heart almost stops beating. The figure has Simon’s face, but disappears even as she stands frozen in shock. 

Bel, born to nobility, would do anything to spend her days alongside her brothers - soaring through the heavens in her beloved flyer. She’s faster than any of them, but she knows her days in the skies are numbered. When a surprise attack on the palace lands Bel’s father on the throne, her life is forever changed. In order to secure her father’s empire, Bel must travel to a distant land to marry Conleith, the recently widowed young ruler. 

The life of an orphan soldier becomes entwined with that of the mysterious heir to the throne, whose very presence draws out the secret magic living inside her: a magic that breaks every law she is duty-bound to uphold. Sold to the Crown in the aftermath of the Last Great War, Grace Marchant has never known her parents. Now, she trains as an elite soldier tracking down mageborn - those born with an ancient and long-outlawed magic - and destroying them if they don’t surrender their power to the Crown.

Sophie has always believed her mother abandoned her, and tries not to dwell on memories of laughter and bedtime stories. Arriving at the renowned Ayredale Library deep in the English countryside, Sophie feels strangely at home among her fellow bookbinders and the endless shelves of antique books. But everything changes when a beautiful door – engraved with a leaf matching her mother’s old necklace – swings open at her touch. Sophie gasps at the impossible sight inside: a silver tree growing higher than the library itself. 

1952: Vivien and Max collide in the thick London smog. Within a few years, their whirlwind romance sees them living a quiet life on the Norfolk coast, blissfully happy with their beautiful daughter—at least, that's how it appears... 2019: Isobel is hoping for a fresh start when she inherits her beloved grandmother Vivien's house in Silverton Bay. But when she discovers an old photograph of Vivien at one of the infamous parties held at Silverton Hall in the 1950s, Isobel is forced to question how well she really knew her grandmother.