March, 1918. Detective Inspector Harvey Marmion and Detective Sergeant Joe Keedy are about to leave Scotland Yard when they hear of a sinister siege involving three burglars, a shoot-out, and an injured policeman. Officers at the scene are led to believe that the burglars remain inside the house, and going against strict orders, Keedy creeps into the house to investigate. Suddenly, another gun shot is heard. Keedy has been shot...Rumours unfurl that the house was occupied by Irish tenants. Had the burglary been planned by terrorists in need of money to fund their campaign against the British government? While Keedy recovers in hospital, Marmion and his team begin to uncover the secrets that lie behind this complex incident...