In 1915 London, an anti-German attack on a bespoke tailoring business leaves the tailor dead, his daughter raped, and his safe empty, and Detective Inspector Harvey Marmion must go all the way to the front lines of World War I and back to find those responsible.

London, Autumn 1916. When he slips out of a house in the early hours of the morning, Simon Wilder is too preoccupied to realize that he is being stalked. As he walks along the street, lights begin to dim as a warning that theres another Zeppelin attack. Guns begin to pound away as British airplanes attack the Zeppelin. Suddenly, it bursts into flame and lights up the whole sky. The crowds cheer as the great fireball drops slowly down and crashes in...

December, 1917. Ada Hobbs has cleaned for Dr Tindall for many years and begins this frosty morning like any other day. But it turns out the house is not empty after all. The blood-covered George Tindall is sprawled across the floor. Detective Inspector Harvey Marmion and Sergeant Joe Keedy arrive to a horrific scene. Someone enjoyed killing Tindall, without a doubt. Their investigation takes them out of London, and on the trail of three different...