Young orphan Esther Summerson is brought to the High Court of Chancery, where she is thrown together with two wards of the court, Richard Carstone and Ada Clare. Both are caught up in the infamous suit of Jarndyce and Jarndyce, which brings nothing but ruin and despair to all it touches. Esther, Richard and Ada are sent to live at Bleak House, where they receive a friendly welcome from their rich guardian John Jarndyce.

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.

Richard's inability to settle causes a rift with John Jarndyce, much to Ada's dismay. Tulkinghorn finally unearths the possible identity of the mysterious Nemo. Nemo's old friend Sergeant George has the evidence he needs to prove it and Tulkinghorn will stop at nothing to force George to hand it over. But George has even more problems when Gridley turns up on his doorstep, on the run from the law and infected with the fever.

George has to make an impossible decision when Tulkinghorn and Smallweed turn up the heat on his debts. Guppy's quest for information takes him back to Krook's shop, with explosive results. Jarndyce is beside himself when tragedy strikes Bleak House.

Tulkinghorn is now close to piecing together Lady Dedlock's secret. Esther struggles to come to terms with the terrible blow she has been dealt. Jarndyce agonises over whether to keep his own feelings for Esther concealed. Lady Dedlock tells Esther something that will change her life for ever.

Richard is in dire straits but Ada and Esther may be too late to help him. An unexpected meeting with Woodcourt raises uncomfortable questions for Esther. Jo the crossing sweeper is critically ill, and despite Woodcourt's best attempts it is a matter of life and death. Tulkinghorn discovers Lady Dedlock's defiance with disastrous consequences.

Richard and Ada's news causes great concern for Esther and Jarndyce. Inspector Bucket's investigation gathers steam when he tracks down the mysterious letter writer. As evidence mounts against Lady Dedlock, Bucket sets a trap for the killer - with astonishing results.

As Bucket wraps up his investigation, there's yet more trouble for Lady Dedlock in the shape of the evil moneylender Smallweed, who has evidence of her secret past and intends to use it. Cornered and desperate, Lady Dedlock makes a terrible decision.

Richard's obsession with Chancery has left him desperately ill. Ada is pregnant but worries Richard will not live to see the child. When Woodcourt proposes marriage, Esther is torn between her love for him and her commitment to Jarndyce. The impossible finally happens - a result in Chancery - but it's one that will astound everybody.