NARRATOR: A young man died in a mysterious car crash. But was it an accident? Forensic science uncovered what really caused that crash. And the truth devastated three different families. [theme music]...

NARRATOR: In the middle of the night, a man watched in horror as his neighbor committed a horrible crime. The perpetrator said he had no recollection of the incident. It would be up to a jury to...

NARRATOR: When an otherwise healthy young man died mysteriously in his sleep, investigators assumed the suicide note explained why. It told the tale of heartbreak, deception, and jealousy. But it told...

NARRATOR: In 1991, a high school girl vanished after attending a party. Her abandoned vehicle was found in a school parking lot near her home. The prime suspect had not one, but two alibi witnesses...

[music playing] NARRATOR: Investigators were overwhelmed by the carnage in a single case, arson, murder, fraud, suicide, and more. The bizarre trail of evidence left even seasoned investigators...