Private bodyguard Alex Drayce meets with the SIO in charge of his wife Lily's reopened murder investigation. With forensic evidence linking her death to the killer of another serving police officer, it should be an open-and-shut case.

When the DNA record comes up blank, Drayce goes on the hunt across the city, a one-man army with no rules. He speaks to witnesses in a manner the police can't, unearthing clues that lead him to a conspiracy between an international organised crime group and the Metropolitan Police.

Risking everything to discover the truth, Drayce refuses to rest until those responsible are punished, fulfilling a promise he made to his wife many years ago.

A blistering, hundred-mile-an-hour urban crime thriller of one man's relentless pursuit of vengeance.