Butch leads Penguin and his men to the warehouse where Gertrude is being held, as Penguin plots his revenge on Galavan for kidnapping his mother. Meanwhile, Nygma deals with the aftermath of a deadly accident.

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.

Bullock's past comes back to haunt him when he and Gordon investigate two murders at Sirens. Meanwhile, Bruce and Alfred explore the tunnels beneath the city, and Penguin and Nygma's plans to escape are thwarted by the least likely of suspects.

On the precipice of Gotham's reunification, Gordon and Bruce find themselves face-to-face with a newly transformed Eduardo, and discover the real mastermind behind the city's current chaos. Meanwhile, a pregnant Barbara turns to Lee for help.