The emperor's reign has lasted for decades, his mastery of bone shard magic powering the animal-like constructs that maintain law and order. But now his rule is failing, and revolution is sweeping across the Empire's many islands. Lin is the emperor's daughter and spends her days trapped in a palace of locked doors and dark secrets. When her father refuses to recognise her as heir to the throne, she vows to prove her worth by mastering the forbidden art of bone shard magic.

Cordelia knows her mother is . . . unusual. Their house doesn’t have any doors between rooms—there are no secrets in this house—and her mother doesn't allow Cordelia to have a single friend. Unless you count Falada, her mother's beautiful white horse. The only time Cordelia feels truly free is on her daily rides with him. But more than simple eccentricity sets her mother apart. Other mothers don’t force their daughters to be silent and motionless for hours, sometimes days, on end. Other mothers aren’t sorcerers.

981 AD. The Viking King of Dublin is dead. His young widow, Gormflaith, has ambitions for her son – and herself – but Ireland is a dangerous place and kings tend not to stay kings for long. Gormflaith also has a secret. She is one of the Fomorians, an immortal race who can do fire-magic. She has kept her powers hidden at all costs, for there are other immortals in this world – like the Tuatha DE Danann, a race of warriors who are sworn to kill Fomorians.

Gemma Ripley has a reputation for being a pampered princess who is more interested in pretty gowns, sparkling jewelry, and other frivolous things than learning how to rule the kingdom of Andvari. But her carefully crafted persona is just an act to hide the fact that Gemma is a powerful mind magier - and a spy. Gemma is undercover, trying to figure out who is stealing large amounts of tearstone from one of the Ripley royal mines when she encounters Prince Leonidas Morricone of Morta - her mortal enemy. She must reluctantly join forces with Leo....

In the first book of a visionary fantasy trilogy with its roots in the mythology of Africa and Arabia that “sings of rebellion, love, and the courage it takes to stand up to tyranny” (Samantha Shannon, author of The Priory of the Orange Tree), three women band together against a cruel empire that divides people by blood.