Everything you need to understand or teach The Haunting of Alaizabel Cray by Chris Wooding.
"The Haunting of Alaizabel Cray" takes place in a fictionalized London, probably in the late 1800s. After an attack on London known as the Vernichtung, London is overrun with wych-kin. Thaniel and Cathaline, two wych-hunters, encounter a girl named Alaizabel. She seems virtuous, but she is somehow connected with a plot to destroy the world. As the novel progresses, Thaniel and Alaizabel fall in love, thwart the plot of the Fraternity, and discover the origin of the wych-kin.
Thaniel is a talented wych-hunter, following in the footsteps of his famous father. Her father however is lonely even though he shares his house with his wych-hunter partner, Cathaline. While out hunting one night, Thaniel encounters a deranged young woman, Alaizabel Cray. She remembers nothing about her past and Thaniel is attracted by her beauty and vulnerability. She has a strange tentacled tattoo at the base of her spine.