The 4th Meeting (2013)

Diana Sheridan is a successful woman, who is just as independent as she is self-serving. Her independence turns to loneliness with the recent death of her husband, and to aid in her transition she invites her younger sister to move in, and starts group counseling for "Survivor's Guilt". But her attempts to counter loneliness only make her more isolated, as she gradually confronts the circumstances surrounding her husband's death.