Showing Good Morning, Midnight by Reginald Hill

Like father like son....But heredity seems to have gone a gene too far when Pal Maciver's suicide in a locked room exactly mirrors that of his father 10 years earlier. In each case, accusing fingers point towards Pal's stepmother, the beautiful, enigmatic Kay Kafka. But she turns out to have a formidable champion: Mid-Yorkshire's own super-heavyweight, Detective Superintendent Andrew Dalziel.