When a highly-trained sniper takes out a patrol car's front tyre, sending it crashing off the highway, the tactics used suggest to Hooker and Romano that the attacker is an ex-Vietnam war veteran gone bad, who has made the hit as practice for a bigger strike. But the culprit is closer to home than they expect, and is planning to turn an upcoming visit by the Mayor to the LCPD headquarters into a nightmare, with his own little war-zone.