The Highgate Priestess by Carmilla Voiez

Five years ago, in what appeared to be a Satanic ritual gone wrong, thirty-six mutilated bodies were discovered in a cellar in Highgate London. The sole survivor, thirteen-year-old Melissa Powell, was removed from the scene in a catatonic state. 

When the infamous Highgate Priestess transfers to Witchwood Prison, inmates complain that she’s sending demons to attack them. How can prison guard, Wanda Jones, uncover the truth behind the priestess's power and avoid losing her sanity, her partner, and her freedom?

The Highgate Priestess is a supernatural LGBT thriller. The story is set in Witchwood Prison, housing the most dangerous women in Britain.