There is another creature of the night other than Sludge. As Sludge tries to investigate he is captured by a man obsessed with finding a cure to his illness. 
The creature of the night (formerly a man known as Don Johanssen) interrupts the "party" seeking revenge against the man that captured Sludge. 
Inevitably a fight between the creature and Sludge takes place. 
All the while Sludge is watched by Lord Pumpkin...