When Will Solvit visits an old castle, he finds himself on his spookiest adventure yet! Ghosts tell him to go back in time, where he discovers: Knights searching for revenge, A fire-breathing dragon, Zoe bossing knights around, Clues to find his mum. Battling bands of ghostly knights and real ones, Will Must prove himself and guard his amulet-which has more power than he ever imagined.