A Dark Knight: The Demon's Head - S4.E4

Bruce Wayne puts the lives of Gotham Natural History Museum historian Niles Winthrop and his grandson, Alex, in danger in an attempt to uncover the meaning behind his prized knife from the auction. Meanwhile, Ra's Al Ghul proves he'll take deadly measures to achieve what he wants. Also, with Sofia Falcone in town, she is on a mission to win back Gotham from Penguin.