When DS Dave Slater and his colleague DS Norman Norman stumble across, and apprehend, a teenage arsonist, it's no surprise to either of them when the youth threatens revenge as he's led away. Two nights later, when Slater is dragged from sleep to be told his friend's flat is on fire, his first thought is that maybe this had been no idle threat. But Norman has gone missing, and when a witness claims to have seen a Russian watching the flats, it soon...