Leary gets more information on the paedophilia ring, and learns that his key witness was a member of the ring. Jacobs is furious when he catches wind of Da Vinci's plan to institute a red light zone, and he and Klotchko partner up to bring the mayor down. Finn and Kosmo investigate two linked shootings -- that of a schoolteacher, and then that of an Indo gang member close by. Ferris gets herself on the wrong side of the firemen after they unknowingly interfere in a grow-op bust. Da Vinci spends the night at Billie Simms' party, not realising that Zack is trying to contact him regarding the raid on the squatters.

Constable Tremaine dies in the grow-op bust because the cops were trying to bust down a door that opens out and things go from bad to worse when Jan Ferris tells her lawyer that she saw a fire inspection notice at the grow-op that tipped off the sitter to the upcoming raid. Meanwhile, thanks to Klotchko's continuing manipulations on Jacobs' behalf, Da Vinci faces opposition from both the city and the firefighters on the new cross-training plan; Leary gets a lead in the paedophile ring when Clarke Messner points the finger at Dubreau, a hotel owner they were looking at.