Seven years have passed since the doors between the worlds were sealed.

Seven years since Kell, Lila and Holland stood against Osaron, a desperate battle that saved the worlds of Red, Grey and White London. Seven years since Kell's magic was shattered, and Holland lost his life. Now Rhy Maresh rules Red London with his new family - his queen, Nadiya, their daughter Ren, and his consort, Alucard.

But his city boils with conspiracy and rebellion, fuelled by rumours he is causing magic to fade from the word. Now Kosika, a child Antari, sits on the throne of White London. The new queen leads her people in new rituals of sacrifice and blood in devotion to the altar of Holland Vosijk, summoning vast power she may not be able to control.

Now Lila and Kell, living free on the waves, are charged by the captain of the Floating Market to retrieve an immensely powerful artefact, stolen by secretive forces. Now Tes, a young woman with a knack for fixing broken things, is thrust into the affairs of Antari and kings, traitors and thieves. And only her unique powers can weave the threads of power together.