With the debut of his first young-adult novel, science fiction writer Terry Pratchett invites readers ages 12 and up to visit discworld -- an imaginary land well known To Pratchett's adult following. At the heart of this...With the debut of his first young-adult novel, science fiction writer Terry Pratchett invites readers ages 12 and up to visit discworld -- an imaginary land well known To Pratchett's adult following. At the heart of this tale is a slightly twisted take on the old pied piper theme, a talking, thinking cat named Maurice, and a supporting cast of equally talented rats who bear such comical names as big savings, nourishing, and dangerous beans.