It is 1868, the week that Benjamin Disraeli becomes Prime Minister of the Empire. Sherlock's beautiful, but poor admirer, Beatrice, the hatter's daughter, appears at the door late at night. She is terrified, claiming that she and her friend have just been attacked by the Spring Heeled Jack on Westminster Bridge and the fiend has made off with her friend. At first Sherlock thinks she simply wants his attention, but soon he is suspicious. Sherlock gets drawn deeper into the pursuit of the Spring Heeled Jack, whose attacks are growing in number...