In Secret is set in Paris, and it takes places in the 1860s. In Secret is about a woman named Therese Raquin, she is the main character. Therese Raquin is married to her first cousin Camille. Camille is in poor health. Therese does not love her husband Camille, and was forced to marry him by her Aunt Madame Raquin. Therese Raquin leads a bring life working in a small shop. She watches her aunt play dominos, and doesn't have much of a social life. Therese meets her husband's best friend Laurent LeClaired, and her boring life changes. Therese and Laurent LeClaired have an affair. Laurent and Therese's affair leads to tragedy, and it also causes heartbreak. Elizabeth Olsen plays the main character Therese Raquin. Tom Felton plays Therese Raquin's husband, and first cousin Camille. Jessica Lange plays Therese Raquin's controlling aunt. Oscar Isaac plays Laurent LeClaired, Therese Raquin's lover, and Camille's best friend.