Bricks and Mortality

In the cold light of dawn, a dead body is found in the smouldering remains of a burnt-out Cotswold manor. Key House has stood empty for years, but its owner, Gervase Crown, was seen nearby just before the blaze. Is he responsible, or was he the intended target? As Campbell and Carter begin their investigation it becomes clear that Gervase wasn't particularly popular and his return reawakens old memories, not all of them good.