In this 8th book in the Key Mystery Series, a summer session of the Penobscot Theatre's Dramatic Academy turns into a deeply puzzling experience for Mandy, Nick and friends. Who-or what-is causing the strange happenings at the old Opera House? Could it be one of the theatre's legendary ghosts--the sinister Shadow Man, the child dressed in white--or is it someone set on sabotaging the show? As the children prepare for their roles in the play, they...