The Fall (Nix novel)

The Fall is the first book in Garth Nix's The Seventh Tower series, published in 2000 by Scholastic in partnership with Lucasfilm under the imprint LucasBooks. It tells the story of Tal, a boy who lives in a world with eternal darkness, whose attempt to steal a Sunstone causes him to fall into the unknown world outside of the mysterious castle he grew up in.