The Fields of Grief by Giles Blunt
This is a terrifying psychological thriller in which a spate of suicides could just be the work of a serial killer; featuring homicide detectives Cardinal and Delorme from the award-winning Forty Words for Sorrow. When John Cardinal's wife plummets to her death after losing her battle with depression, everyone is sure it is a tragic suicide - there's even a note. Everyone, that is, except Detective John Cardinal. Stricken with grief and guilt, Cardinal launches his own investigation, helped by his reluctant colleagues. When mysterious notes appear, taunting him for his loss, his theory suddenly seems to be credible. Cardinal revisits his past, searching for a possible suspect among his previous arrests. Someone is with a grudge, a person twisted enough to target his innocent wife in revenge. But, when more mysterious suicides are discovered, the investigation takes a very different turn, leading to a startling new possibility - one so shocking, it has never been suspected!