Many of the country's leading scientists and intellectuals who choose to stay "warm" (including Sherlock Holmes) are imprisoned in concentration camps in the rural counties.

Beauregard, an agent of the Diogenes Club, is tasked with hunting down the killer, dubbed "Silver Knife" by the public, until an anonymous letter is delivered identifying him as "Jack the Ripper".

The victim's inquest is attended by Lestrade, Dieudonné, and Beauregard, along with Captain Kostaki (an officer in Dracula's Carpathian Guard), and Dr. Henry Jekyll.

Beauregard is abducted by an old enemy, a Tong leader who calls a truce on the understanding that the London underworld also has a strong interest in Silver Knife's capture.

The implication is lost on Dieudonné and Beauregard, none of whom know that Seward, driven insane with grief over the loss of his love, Lucy Westenra, has taken to hunting vampires on his own.

In her haste, she allows Godalming to turn her, but the transformation is imperfect, and Penny almost dies, before Beauregard nurses her back to health with Dieudonné's help.

Lord Godalming questions Kostaki in secret, believing he has identified the Ripper as Sergeant Dravot, a vampire agent of the Diogenes Club.

These orders required him to kill Mackenzie, foment the riots, and stand by as Seward butchered Mary Jane Kelly.

He is told that Dravot, a vampire, could not be given the official credit for solving the murders, and it is necessary for Beauregard to carry out the final step of the plan.

Beauregard soon understands what this means when he and Dieudonné are invited to Buckingham Palace to be officially thanked by Queen Victoria for their role in catching the Ripper.

Before the vampires can retaliate, a riot breaks loose outside the Palace – possibly orchestrated by the club – and spills inside, allowing Beauregard and Dieudonné to escape and forcing Dracula to flee the country.