What would you do if your darkest nightmare came true? For Anna Kronberg, time is running out. Hunted by an assassin, she has to find the true motivation behind her dead husband's plan to create weapons for germ warfare. Bit by bit, she and Sherlock Holmes unravel a web of crime, espionage, and bioterrorism that spreads across continents. But all too soon, Anna realises that she can't outrun the brutal and cunning man who follows their every step.