Leary gets more information on the pedophilia 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.