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"Take it by the Throat" is a novel about witches from the Discworld series by Terry Pratchett.

The witches of Lancre once again have to save their homeland. King Verence has received dangerous guests from Uberwald: a family of vampires who like to drink wine, eat garlic and sunbathe. And these modern vampires are not afraid of holy water at all, they are hardened by it. The guests decide to stay in Lancre forever, seize power and introduce new orders, and for those who disagree, they will hear a simple command* Carpe Jugulum* - "Take it by the throat!"

It seems that only Tituna Ogg, Magrat Garlic, Agnes Nitt and, of course, Granny Rainbow can save the kingdom from the change of power and the cultivated bloodlust.