Blue Moon by Laurell K Hamilton

This narrative follows Anita Blake, a "vampire executioner" and "animator" who raises the dead, as she navigates a complex supernatural world to clear her former lover, Richard Zeeman, of a false rape accusation. The story sees Anita confronting Master Vampire Colin, who holds Richard, and eventually a human sorcerer, Linus Beck, and his employer, Franklin Niley, who are involved in the murder of Richard's accuser, Betty Schaffer, and plan to sacrifice Richard's mother, Charlotte, to summon a demon. Throughout her quest, Anita juggles her strained relationships with Richard and the Master Vampire Jean-Claude, experiences burgeoning powers and deepening bonds with her werewolf and wereleopard associates, and grapples with the ethical implications of her violent profession and evolving personal identity within the supernatural community. The climax involves a ritual battle against the summoned demon and the villains, forcing Anita to confront her own darkness and make difficult, brutal choices to protect her allies.