"A Dark Knight: They Who Hide Behind Masks" is the third episode of the fourth season of Gotham. It aired on October 5, 2017.
Gordon takes matters into his own hands when he travels to Miami in attempts to persuade Carmine Falcone for his help in the fight against Penguin. There, he meets Carmine's daughter, Sofia, who unexpectedly follows Gordon back to Gotham. The battle for Penguin's prized weaponry continues during auction night at the Iceberg Lounge and Bruce's presence puts him on Penguin's radar.