Shen Teal Travelled to our own World in the book Prince Yifan, where he met the young murderess Qing Shur. Now he is pitched into a completely different World - a planet called Mara, where he is on a quest to destroy the Demon device that holds the world away from the last humans.

But his demon companion oozes through to Joseon, Teal's home, and imperils our own Earth. Teal's father and the enigmatic Captain de Vlieger come together to fight for their World, and to recover Qing Shur from a gigantic space station, in this, the fourth book in the Worlds of Yifan series.

Strong themes and compelling characters drive towards a catastrophic outcome, where the fate of the Worlds is in the balance...