September 1, 2256. 'My name is Cataline, and tonight I will become the most wanted man in the galaxy.'Vengeance has a long memory. For years, the Republic has enjoyed a hard-won peace on the ashes of the old Empire, but those ashes are beginning to stir. When the mysterious Cataline, a vengeful ghost long thought dead, unleashes a devasting attack on London, Detective Walker's warnings are finally heard: the ghost is alive, ruthless and angry.Caught between the family he loves and the fragile peace he swore to uphold, Walker leads an elite team of outcasts on a hunt spanning the solar system. From the cities of Earth and the Moon to the frozen depths of Europa, they uncover a conspiracy of buried secrets and horrifying human-to-machine experiments.In a race against a man who has nothing left to lose, Walker must decide what he's willing to sacrifice to save the Republic before Cataline's vengeance consumes it.