Narrated by Rupert Degas, and behind-the-scenes diaries narrated by the author and screenwriter Mark Stay. This audiobook also features exclusive sound-effects from the film. To find his father, one boy must defy an empire....Three years ago, Earth was conquered by a force of robots from a distant world. They have one rule: stay in your homes. Step outside and you get one warning before you're vaporised by a massive robot Sentry, or a crawling Sniper, or a flying Drone.