Sir John feels responsible, as he was the one who had recommended that Diana take the touring job in order for her to get more life experience. It also turns out that Diana has been a fan of his since childhood. She is beautiful, and seems far too honest and straightforward to be a criminal of any kind. Using skills he has learned in the theatre, Sir John investigates the murder with the help of the stage manager Ted Markham (Edward Chapman) and his wife Doucie (Phyllis Konstam). They narrow the possible suspects down to one male actor in the troupe, Handel Fane (Esme Percy), who often plays cross-dressing roles.