With thousands of Britons fighting in the trenches, a severely depleted police force remains behind to keep the Home Front safe and continue the fight against crime, espionage, and military desertion. In London, Scotland Yard is already overstretched when the sinking of the Lusitania sparks an unprecedented wave of anti-German riots and arson attacks across the city. Among the victims are the immigrant tailor Jacob Stein, found dead in his burnt-out shop.