She co-directed, with Tomm Moore, The Secret of Kells, an animated feature film as well as doing additional voice acting for the film. The film is set in 9th century Ireland, at the time when the Book of Kells was written. In it, a 12 year old orphan boy living at a monastery has the task of finishing a book with the art of illumination. The film premiered at the Berlin International Film Festival in February 2009. The Secret of Kells has been nominated in the category of Best Animated Feature Film at the 82nd Academy Awards.