As best I can tell - deservedly on various lists of the best novels in English literature.
Main story involves Dorothea - something of a do-gooder - drops the fiance folks that she would marry (with every expectation of a good match) to marry a middle-aged, not-robust scholar (Casaubon) who she thought was involved in a great work, and she thought it would be great to be his assistant. This didn't work out so well. There were a few other story lines as well, quite a few characters.
Would be worth a re-read.