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, and a secret that people would kill to discover. On the run for their lives, Eddie and George must join forces to escape the clutches of a depraved genius - a man who needs the secret for a terrifying plan. Helped by the redoubtable Sir William Protheroe and actress Elizabeth Oldfield, they find themselves in a heart-stopping race against time. A race to unravel the secret before London is overrun by creatures from the dead...