Eleven-year-old Jon Whitcroft and new friend Ella summon the ghost of Sir William Longspee, who may be able to protect Jon from a group of ghosts that threatens him harm from the day he arrives at Salisbury Cathedral's boarding school. Includes historical notes. Interest Level: 3-6 Reading Level: 4.6 ATOS Book Level: 5 AR Interest Level: MG AR Points: 7 AR Quiz: 151401EN Reading Counts Level: 4.6 Reading Counts Points: 10 Lexile Measure: 760 Fountas & Pinnell: W.