Despite the dark, "body horror" elements, the novel is a story about the bonds of love, particularly the protective relationship between Mackie and his human sister, Emma. Audience & Reception Genre: YA Paranormal / Dark Fantasy.

El Sustituto (English title: The Replacement ) by Brenna Yovanoff is a dark YA paranormal/horror standalone novel, originally published in 2010, which explores themes of identity, otherness, and sacrifice within a gothic setting. The story centers on Mackie Doyle, a teenage changeling ("Replacement") living in the eerie, insular town of Gentry, who must navigate his place between the human world and the dangerous fae underworld. Core Storyline

Yovanoff's prose is noted for being "spare but haunting".

Mackie must navigate "Mayhem," the dangerous underworld beneath the town populated by dark creatures (like "the Cutter") and ruled by the Morrigan.