Season 4

After he clashes with co-workers, Tom Monfils mysteriously disappears on the job at a Green Bay paper mill. Soon enough it looks like murder, but no one is talking to detectives. Is it a conspiracy of silence, or a tragic miscarriage of justice?

Mother of four Becky Sue ends her relationship with her abusive boyfriend, and decides to move in with a relative for a fresh start. However, some people suspect foul play when she suddenly goes missing before testifying against her abusive boyfriend.

A young mother from Austin, Texas suddenly drops out of contact. Police believe she may be taking a break somewhere, possibly with a new man. But Julie's family fears the worst.

A talented graduate student is nursing a broken heart, when she's swept off her feet by someone new. But as their relationship progresses, revelations make it clear nothing is quite what it appears to be. [also marked as S4:E1]

In Phoenix, a wave of late night sexual assaults appear to be the work of a serial rapist, who targets women in their own homes while they sleep.

In 1995, three members of a wealthy Taiwanese family living in Virginia disappear. Rumor has it they died overseas but when detectives investigate, they find answers closer to home.

A prominent psychiatrist and his adult son are killed execution style. When police can't find a suspect, the case goes cold. But when an attempted armored car robbery provides an odd link to the double homicide months later, a motive is revealed.

When Jamey Walker, a young woman with a bright future is kidnapped and murdered in the spring of 1981, her mother Eleanor dedicates the rest of her life to finding the killer in hopes of finding justice for Jamey.

When 12 year-old Courtney LeBlanc is kidnapped from her home, her family fears she's fallen prey to a serial killer terrorizing the community. Local investigators enlist the help of the FBI and their search reveals a predator hiding in plain sight.

Kidnapped just steps from her home, a 15-year-old girl is brutally assaulted and left for dead in Denver's South Platte River.