Mr Dorrit leaves Amy behind in Venice as he returns to London with newlyweds Fanny and Sparkler, but the high life is not all he had hoped it would be. Meanwhile, Arthur invests Doyce and Clennam's capital in Merdle's Bank, and Flora investigates the disappearance of Rigaud.

Mr Dorrit returns to Venice, a broken man, after a visit to London revives unwelcome memories. Arthur warns his mother that she may be in danger from Rigaud. And Amy and Arthur meet again.

Mr Merdle's death and the collapse of Merdle's Bank sends shockwaves through London as thousands face financial ruin. Arthur returns to the Marshalsea a prisoner, Amy goes back to her birthplace to look after him as he lies gravely ill, and Rigaud returns to play out his blackmail in the Clennam house.