What metaphors are there in Cirque Du Freak?

"Cirque Du Freak" uses metaphors such as comparing the vampires to a separate, secretive society hidden from the human world. Another metaphor is the struggle between light and darkness, symbolizing good vs. evil within the characters' choices and actions. The character of Mr. Crepsley can be seen as a metaphor for the complexities of morality and the blurred lines between good and bad.