Forbidden Desires: Her Deadly Love | In Secret (2013)

Like many young women her age, Thérèse (Elizabeth Olsen) longs for true love — to find that one person meant just for her. But reality hits hard. Under the iron will of her domineering aunt, Madame Raquin (Jessica Lange), Thérèse is forced into a loveless marriage with her sickly cousin Camille (Tom Felton).
Trapped in a miserable life, Thérèse sees no way out — until she meets Laurent (Oscar Isaac), Camille’s charming and seductive friend. Their affair is reckless, passionate... and deadly. Together, Thérèse and Laurent plot and carry out Camille’s murder, hoping to finally claim freedom and fortune.
But their twisted romance soon turns into a nightmare, as they’re haunted — not just by guilt, but by the vengeful spirit of the man they killed.