 It stars Allie MacDonald as a hopeful young singer terrorized by a killer at a musical theater camp.In 2004, Broadway diva Kylie Swanson opened the musical "The Haunting of the Opera" (a reference to real-life musical "The Phantom of the Opera") to a packed audience.However, that same night, she was murdered backstage by an unknown assailant wearing the mask of the play's villain, Opera Ghost.