"In the 1880s the Dublin Metropolitan Police classified crime in two distinct classes. Political crimes were classed as 'special,' whereas theft, robbery and even murder ... were known as 'ordinary.' [In] June 1887, the city swelters in a long summer heatwave, the criminal underworld simmers, and with it, the threat of nationalist violence is growing ... Then the mutilated bodies of a man and a child are discovered in Phoenix Park and Detective Sergeant...