As far as I can remember, I have never read anything by George Sand (the pen name of French author, Amantine Lucile Aurore Dupin de Francueil). But Wikipedia tells me that in the 1830s and 1840s she was more renowned in England than both Victor Hugo and Honoré de Balzac, and that she is one of the most notable writers of the European Romantic era.
Where better to start than with her 1846 title, La Mare au Diable or The Devil’s Pool, the first in a series of four pastoral novels based on the author’s childhood. This rustic novel, set in the French countryside, explores how love can transcend convention and class obstacles.
You can download a copy of the e-book from Project Gutenberg, and a LibriVox audiobook version is also available. But any unabridged edition (paper, digital or audiobook) is fine.