A bank vault beneath London stores a secret more precious than gold. 

When ex-soldier and security specialist Ben Drummond receives a late-night phone call from Britain’s National Crime Agency requesting his aid, he finds himself pitched into a deadly investigation: six tonnes of gold is missing from one of London’s biggest bullion banks and a guard brutally murdered. How the gold was stolen from one of London’s most secure vaults, deep beneath the River Thames, is a baffling mystery.

As Drummond and a high-ranking NCA agent, Alex Fern, begin to sort through the bizarre series of clues left behind, they soon discover that the bank vault beneath London stores a secret more precious than gold: a conspiracy bigger and more dangerous than they could ever have imagined. A secret that people will kill to protect.