The Poisoner's Ring

Edinburgh, 1869. Mallory Atkinson, a homicide detective from the present day, is living in the body of a housemaid named Catriona Mitchell. Her employers know who she really is, and she now holds an official post as an undertaker's assistant.

She works alongside Dr. Duncan Gray, who also acts as a medical examiner on the side. Their newest case involves men of the city dying from a powerful poison. Suspicion falls on the grieving widows, and one of them is Gray's oldest sister.

Poison has a reputation as a woman's weapon, but Mallory doubts the answer is that tidy. Her training from another century tells her to look past the obvious suspects, and the case gives her little room to do so.

Every move the household makes is watched, and no one can say where the inquiry will lead. A historical mystery with a time-slip premise, it follows Mallory as she hunts a 19th-century killer while still looking for a way back to her own time.