In Secret was based on a book from the 1800's.
In Secret . Based on Émile Zola 's 1867 classic novel Thérèse Raquin , the film stars Elizabeth Olsen , Tom Felton , Oscar Isaac and Jessica Lange . Thérèse Raquin [ teʁɛz ʁakɛ̃ ] is a novel ( first published in 1867 ) and a play ( first performed in 1873 ) by the French writer Émile Zola .