Disappeared - Season 4 Episode 1 Missing Valentine

Forty-two-year-old Patricia Viola is living the life of her dreams. She has two wonderful children and a happy, stable marriage. On February 13, 2001, Pat wakes up, gets the kids ready for school, and then volunteers at the local library. She returns home, briefly calls her mother, and then is never seen or heard from again. Police immediately launch an investigation to determine if Pat was the victim of foul play or if she left voluntarily. Ten years later, a private investigator stumbles on a surprising connection between Pat and a triple homicide that could blow the case wide open.