"Abhorsen" is a fantasy novel by Garth Nix, part of the Old Kingdom series. It follows the journey of Lirael, a young woman who discovers her identity as a Charter Mage and her connection to the ancient role of the Abhorsen, a necromancer who binds the dead and protects the living from the dangers of the Old Kingdom. The story explores themes of duty, identity, and the struggle between life and death. Lirael, along with her companion Nicholas Sayre, faces various challenges as they confront the dark forces threatening their world, including the powerful Necromancer Abhorsen must stop.