Mr. REE in the Theatre

Mr. REE and Reggie find themselves involved in a locked-room mystery in a newly renovated Boston theatre. A cloaked figure known as the Specter is murdering the cast and crew, all of whom were present when the original theatre burnt to the ground and four people perished. Time is running out for everyone when they become trapped inside without hope of escape. Is it a ghost returning from the grave to seek vengeance, or is the killer among them?