Alone in London, Caroline is mudlarking when she uncovers an eighteen century vial. From its markings, she believes it belonged to an apothecary in Bear Lane and she is determined to uncover its secrets, but there is more at stake than she first realizes—breaking and entering, murder, and even the police suspect Caroline of attempting to poison her unfaithful husband.
Can she uncover details of the mysterious owner of the apothecary who not only catered to women’s ailments, but supplied poisons to women with grudges against men’s behaviour? Who was this pharmacist from long ago? What made her enter this dangerous trade? And who was the young girl who was spotted near the River Thames with her?