My Family's Secret (2010)

When her husband attempts suicide believing he was involved in his younger sister's death, the young wife visits his home town in search of answers from his family. She meets and grows close to his timid brother, who has dissociative identity disorder. As she begins to get closer to the truth, however, she realises that she may be in danger as she has inadvertently angered one of the brother's personalities, and he will do anything to keep the past buried.