Mr. Brook is an unmarried gentleman and his two nieces -- Dorothea and Celia -- lives with him. Book opens with a description of Dorothea, about her simple, puritanic and high religious nature. Sir Chettam, their neighbour has his eyes on her as a prospective wife, but she marries Casaubon, a clergy man of wealth and high knowledge who is old enough to be her father. Chettam later marries Celia.
Now Raffles stirs the past again and the word spreads; Will won't take any part of that evil wealth. So when Raffles dies everyone thinks Bulstrode has something to do with it and he is forced to flee from Middlemarch with his wife.