London, 1917. Deep inside Room 40, a highly secretive organization within the Admiralty, the body of a man has been found in a room locked from the inside with no other apparent exit. In his pocket is a highly confidential telegram which would be political dynamite if it were to fall into the wrong hands. Intelligence agent Patrick Gallagher gathers the potential witnesses at his family’s home, Hartlake Hall. But there a ruthless killer continues to pull the strings from the shadows, and more bodies pile up. As the First World War rages on in Europe, many of the guests have secrets to hide. Gallagher must move quickly in order to expose a deadly spy among them
