She remembered the conversation she’d had with Mary Blakiston just two days before Brent had called her to the house. Dr Redwing had discovered something. It was quite serious, and she’d been about to go and find Arthur to ask his advice when the housekeeper had suddenly appeared as if summoned by a malignant spirit. And so she had told her instead. Somehow, during the course of a busy day, a bottle had gone missing from the surgery. The contents, in the wrong hands, could be highly dangerous and it was clear that somebody must have taken it.
Mary seems to know everyone's dark secrets. What else does she know that could make her a target?
