In stealing magical artifacts for the Resistance, bounding over rooftops to evade Imperial soldiers, and establishing herself as the darling thief of the underground, Arian lives a dangerous life. She'll steal anything for the right price, and if she runs fast enough, she can almost escape the fact that her mother is dead, her father is missing, and her brother, Liam, is tamping down a wealth of power in a city that has outlawed magic.

But then the mysterious Cavar comes to town with a job for the twins: to steal an artifact capable of ripping the souls from the living - the same artifact that used to hang around the neck of Arian's mother. Suddenly, her past is no longer buried but intimately tied to the mission at hand, and Arian must face her guilt and pain head-on in order to pull off the heist.