His final novel, "The Castle in the Forest", which focused on Hitler's childhood, reached number five on the "Times" best-seller list after publication in January 2007. It received reviews that were more positive than any of his books since "The Executioner's Song." "Castle" was intended to be the first volume of a trilogy, but Mailer died several months after it was completed. "The Castle in the Forest" received a laudatory 6,200-word front-page review by Lee Siegel in the "New York Times Book Review", as well as a Bad Sex in Fiction Award by the "Literary Review" magazine.