Case Three. Snaith and the guys close in on London's longest running serial killer - a monster who taunts the Force by leaves a single jigsaw piece about his victim.
A paradigm shift in Snaith's thinking blows the case apart, simultaneously exposing cynical conspiracies, religious opportunism, and one of the many flaws at the heart of human nature.
Snaith is forced to dance to the tune of his media sidekick, fruitlessly searching London's battered hinterland while international concern spreads as far as the Vatican itself.