Hollis reprimands three youths who are seen harassing a bus driver, but the situation takes a dangerous turn when one of the youths pulls out a gun, and they hijack the bus with Hollis, the driver and a busload of terrified passengers. When Hollis realizes that the gun is one of the replicas from the Coal Lane estate, it backfires, hitting the driver. Best and Harman spot the runaway bus and end up in pursuit, but their moment of glory is lost when Taviner and Murphy take over the pursuit in the area car. Meanwhile, Harman and Tait investigate a green-thumbed resident at a retirement home, whose plants are not exactly of the legal variety, and Page's friend Dr. Owen Preston comes under suspicion.