“The Risk of Darkness” by Susan Hill.
This is the third Simon Serrailler novel. I really enjoyed the first two, but this one? Not so much. I can’t put my finger on why – I think it’s partly because there were so many sub-plots that weren’t resolved satisfactorily, and even the main plot wasn’t really resolved that satisfactorily, so I felt quite… dissatisfied. I don’t like having lots of loose ends at the end of crime novels. He should have got Miss Marple in to help him solve everything.