It's long.
Though it's composed of many side stories and characters, Bleak House revolves around Esther Summerson, an orphan with a dark past, whose life is well, bleak. Until she and two others: Ada Clare and her cousin, Richard Carstone, are sent to live with John Jarndyce. Jarndyce is involved in an long, ongoing Chancery Court case Jarndyce v Jarndyce. If successful, Jarndyce could win a great deal of money, but he's not hopeful and considers the case a burden more than anything else. Soon, Richard becomes involved in the case, eager to win some of the inheritance, but is dissuaded by his family and friends as he's known for being irresponsible with his finances. The case is a matter of disputed wills, and has run through generation after generation without settling. Not only is it seemingly pointless for Richard to become involved, but distracting from his love interest, Ada.Bleak House is filled with numerous other characters, some are which described as his best ever: Lady Dedlock, Sir Leicester, Mr. George, and many others. Together, the characters and stories work to showcase some of the absurdities of 19th century English law and society. Dickens goes to prove that the legal system and those in it are corrupt and greedy and class divisions are not what they seem, with "do good" upper class attempting to fix the lives of others who have never asked for such help in the first place.
There are 40 illustrations in Bleak House, and all were done by Hablot Browne, better known as Phiz.
Remember the part about Bleak House being long? Well, it still is. But after reading it, I couldn't believe just how much Dickens fit into that one book. There are just so many interesting side plots and characters, that looking back on it, it doesn't seem as long as it could've been. But maybe this is just hindsight bias.
Overall, if you have a lot of free time (or even if you don't), read Charles Dickens' Bleak House.
