Looking into the matter of stolen copper from a building site, Roach and Bannerman meet Billy Alty, the site foreman, who rules his Irish labourers with the law of his own two fists. But the Irish have their own laws too, and trouble is brewing.

One of those 'nice quiet nights' at Newtown station and Sgt. Stone is just preparing to leave for home. Then the window of a pet shop is broken and Z-Victor One is called to a domestic disturbance, with a report of shouts and possible screams.

Bannerman enters for an inter-divisional boxing match and is curious to know why DI Witty begins to take an almost fanatical interest in his training. Then a punch-up of a far more serious nature takes place near Bartley's fairground.