Old refurbished theatre, the Beryl, is re-opening. Days before opening night, the ghost light - left on at night to appease the ghosts of actors - is extinguished.
Alice digs into the Beryl's past, sleuthing in a network of dark backstage corridors and cobwebby storage rooms.
Gradually, she starts to uncover the hundred-year-old secret of the theatre: a stolen diamond.
Is the Beryl haunted by a ghost - or a living thief?