When Eddie 'Dipper' Hopkins steals George Archer's wallet he has no idea that he is about to enter a dark world of grave-robbing, assassins and zombies.

For George Archer is no ordinary citizen. He has just been offered a job in the top secret Department of Unclassified Artefacts at the British Museum - a department that investigates the bizarre and the unexplained. And in George's wallet is a clue to one of the biggest mysteries of all - a secret that has remained hidden for millions of years...