Investigating a reported disturbance, Dave Graham finds it is one more skirmish in a running war fought with stones between the boys of a local school and old Lewis, an eccentric character who lives in the house opposite. It's not long before Sgt. Blackitt appears on the scene. When he is followed by Sgt. Watt Graham has little to do but sit in the car and watch.
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Ready to Watch Z Cars, Season 4, Episode 14?