Mokoya and Akeha, the twin children of the Protector, were sold to the Grand Monastery as children. While Mokoya developed her strange prophetic gift, Akeha was always the one who could see the strings that moved adults to action. While his sister received visions of what would be, Akeha realised what could be. What's more, he saw the sickness at the heart of his mother's Protectorate. A rebellion is growing. The Machinists discover new technologies to move the world every day, while the Tensors manipulate the elemental natures of the Slack to put them down and preserve the power of the state. Unwilling to continue to play a pawn in his mother's twisted schemes, Akeha leaves the Tensorate behind and falls in with the rebels. But every step Akeha takes towards the Machinists is a step away from his sister Mokoya. Can Akeha find peace without shattering the bond he shares with his twin sister? The Black Tides of Heaven is being released simultaneously with its sibling novella The Red Threads of Fortune. Read both standalones to discover both sides of the story.