Hildur Knútsdóttir was born in Reykjavík, Iceland. She writes fiction for both adults and teenagers, as well as plays, screenplays and short fiction. Hildur is known for her evocative fantastical fiction and spine-chilling horror.

Her horror novella The Night Guest was chosen one of the best thrillers of 2024 by The New York Times. Her work has been nominated for The Locus Awards, World Fantasy Awards, The Dublin Literary Award and The Nordic Council Children and Young People’s Literature Prize, and has been awarded The Icelandic Women’s Literary Prize, The Icelandic Literature Prize, The Reykjavík Children’s Literature Prize for best original work and The Icelandic Bookseller’s Prize.