What if there was a 3D printer that could copy a living human being? Tom Chan's father is building one in his laboratory at Coolabah City University. When 13 year old Tom and his neighbour Bethany 'Biff' Potts take shelter the lab during a thunderstorm and accidentally print a copy of Tom-a doppelgänger with no memories and no personality-they try to pass him/it off, as 'Ben', Tom's long-lost twin from China. But there are dark forces at work who want to clone humans for sinister reasons and they kidnap Ben in order to perfect their own human Replicator. Rescuing Ben leads Biff, Tom and their friends Pandora and Gormley on a wild pursuit through the labyrinth of WW2 tunnels beneath Coolabah City, unearthing political machinations and grotesque secrets kept hidden for 70 years. But Ben also has a secret... A masterful novel that explores the powerful bonds of teenage friendship and what it means to be human.