Rosie McLeod, pub proprietor and a gifted herbalist of local renown, is thirty-nine and holding, but only just. The talons of her fortieth birthday are in her back and her bloody, bloody husband hasn't laid a lustful hand on her for months.
So she sets out to discover if her husband is having an affair, using deductive powers based solely on the careful preparation of plants and herbs. But as her well-laid plans entirely fall apart, the sighting of a large black cat sets off another chain of events.
Rosie now realises that a psychopath is on the loose - and that she's been selected as his next victim.