The Ghosts of Motley Hall S01 E05 Perfida Blackart Rides Again

"What they can do when no one can see them"

It's just been discovered that Motley Hall is 400 years old, so to commemorate this, the ghosts decide to hold a Masque. But when Bodkin tries to write it, the pages of the history book that might finally identify the mysterious White Lady have disappeared! Was she somebody so horrible that she doesn't want it to be found out and her deep dark secret revealed?