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. 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 the clone off, as 'Ben, ' Tom's long-lost twin from China. But there are dark forces at work who want human clones for sinister reasons and they kidnap Ben in order to perfect their own human Replicator. Rescuing Ben leads Biff, Tom and their friends on a wild pursuit through the labyrinth of WW2 tunnels beneath Coolabah City, unearthing political machinations and grotesque secrets kept hidden for 70 years. And Ben also has a secret...