Derek Landy is an Irish author and screenwriter, best known for the Skulduggery Pleasant and Demon Road book series. Since 2018, he has also written numerous comic book series at Marvel Comics.

Skulduggery Pleasant is a series of dark fantasy novels written by Irish author Derek Landy. Tom Percival is the series' illustrator. The books revolve around the adventures of fledgling detective Valkyrie Cain and her mentor Skulduggery Pleasant, along with other friends and allies. The central story concerns Valkyrie's struggle to stop evil forces threatening the world and her internal struggle to resist the darkness within.