Despite his grim discovery, Tulkinghorn remains undeterred from his ruthless inquiry into Lady Dedlock's past. A young crossing sweeper, Jo, may hold a key to the mystery. Krook discovers evidence in Nemo's room which could provide a crucial clue. Richard and Ada plan their engagement, but receive an unexpected setback. And as Richard begins a career in medicine, Esther meets an attractive young doctor called Allan Woodcourt.

As Tulkinghorn edges closer to the truth, Lady Dedlock puts her reputation at risk when she pays an undercover visit to Nemo's former haunts. John Jarndyce finds himself increasingly attracted to Esther, but Richard makes an announcement which causes him dismay. And Woodcourt has news that comes as a terrible blow to Esther.