The acclaimed Engines of Light series that began with COSMONAUT KEEP and DARK LIGHT reaches its staggering conclusion in ENGINE CITY. For ten thousand years the varied races of the Second Sphere lived in peaceful co-existence, building their civilisations under the gaze of the ever-vigilant cometary minds. But then the cosmonauts of the Bright Star came. And with them they have brought a revolution. For one of the Bright Star's crew has warned that an invasion of the Second Sphere is imminent