Dateline NBC

Investigators discover a car engulfed in flames in a remote wooded area near the Blue Mountains; when first responders pull the body of a local mother from the wreckage, the question arises: was the crash an accident, or something far more sinister?

In rural Wisconsin, a couple is found stabbed to death at home. Thirty years later, the daughter of one of the original suspects comes forward, reigniting the case. Keith Morrison reports.

When Tom Perez Jr.'s father fails to return home after a quick trip to check his mail, Tom Jr. calls police for help — only to find himself the focus of their investigation. He would ultimately spend more than 24-hours speaking with police, an ordeal that pushed him to the brink and raised urgent questions about what can happen inside an interrogation room. Then, a stunning revelation upends the case. 

INTERVIEWS WITH: Perez family friend Carl Peraza, Community Service Officer Joanna Pina, Detectives David Jenusz and Kyle Guthrie, and others.

Responding to a call at an Iowa farmhouse, police discover Karina Cooper sitting on her husband's blood-covered body in his recliner. In the aftermath of his murder, rumors sweep through the small town, but detectives must uncover whether the talk is gossip or a crucial clue.

INTERVIEWS WITH: Ryan Cooper's brother Aaron Cooper and sister Michelle Wilson, friends of the couple Ashton Wilson, Jamie and Carmen Earhart and Kirstie Seda, Detective Trevor Killian, Sheriff Casey Schmidt and others.