The long-awaited conclusion to the series that mixes modern urban fantasy with Regency/Victorian society from “an extraordinary new voice in SF/F” (Paul Cornell, Hugo Award-winning author).

As the Iris family consolidates their hold on society within the secret world of the Nether, William Iris finds himself more powerful and yet more vulnerable than ever. His wife, Cathy, has left him, a fact that will destroy him if it becomes public. To keep his position—and survive—he needs to get her back, whatever the cost. 
Cathy has finally escaped the Nether but hates that she must rely so heavily on Sam’s protection. When the strange sorceress Beatrice offers her a chance to earn true freedom by joining the quest Sam has been bound to, Cathy agrees. But can she and Sam navigate Beatrice’s plans for the future without becoming two more of her victims? 
And Beatrice, a self-taught and powerful killer, is not without her enemies. Rupert, the last sorcerer of Albion, is obsessed with finding and destroying her. He orders Max and his gargoyle to help him, pulling them away from protecting innocents. As the Arbiter and his partner face the ugly side of their responsibilities to Rupert, they begin to question where their loyalties should truly lie. 
Amidst death, deceit, and the fight for freedom, friendships are tested, families are destroyed, and heroes are forged as the battle to control the Split Worlds rages to its climatic conclusion.
Praise for the Split Worlds series

“JK Rowling meets Georgette Heyer.”—The Guardian