The hunter becomes the hunted, as the Doctor tracks the Agent from Paris towards the Silver Devastation. The Doctor hopes the Agent will lead him to where the Crystal can be destroyed. Following the trail, Gisella and the Doctor arrive at an elegant country house where they are welcomed to join the game. The rules are simple: survive the night and you are the winner. But where is the robot Agent, and why did it come here? This amazing ten-book series follows the Doctor on his exciting journey to discover the origins of the so-called Eternity Crystal and the powerful artisans who have created it – the Darksmiths.