The Vows of Silence (Simon Serrailler #4)

The Vows of Silence (Simon Serrailler #4)
Gunmen terrorize women in the Cathedral town of Lafferton. What — if anything — links apparently random murders? Is rifle marksman same person as killer with handgun? Simon Serrailler uses well-tried police methods - questions neighbors, searches house-to-house. His sister Cat is back with family from Australia but tragedy strikes her warm farmhouse.