He turns to Penguin for help, rightly suspecting that the dirty cop behind the witness' murder has ties to the underworld. Penguin, high on his recent victory over Fish Mooney, is only to happy to comply, but of course Gordon's insistence that no one be hurt during this "investigation" falls on deaf ears.
This week's episode also brings the return of young Master Bruce. Recently returned from Switzerland, he's desperately searching for Cat - but she's not nearly as happy to see him, and denies having seen who killed his parents after all. He's crushed, but after she leaves (and he weeps by the fireplace for a while) he vows to keep searching for the killer.