A family of four is found dead inside a partially burned Indiana home; when investigators discover that two of the victims died from gunshot wounds, the race is on to determine whether the killer was a stranger or someone closer to home.

An elderly couple and their daughter are found beaten and stabbed in their home in central Texas; from potential family members to disgruntled employees, investigators consider many suspects and leads before finding answers in an unlikely place.

After a teenage son reports his family shot and stabbed to death, police discover the dead father's prior law enforcement ties made a revenge killing likely; however, as investigators delve deeper, they realize the murders are much more personal.

When three generations of a family are murdered inside their Bakersfield home, police find their main suspect was over 2,000 miles away at the time; it will take the combined efforts of law enforcement and an entomologist to deliver justice.

When two families in different neighborhoods are brutally murdered within a week of each other, the city of Richmond goes into an uproar; with only limited leads, police face mounting pressure to find the killers before they strike again.

When a house fire reveals the violent murder of an entire family, the town of Fishkill is shaken; state investigators dig into the victims' past and uncover disturbing connections while using the latest technology to find the killers.

Sheriff’s deputies in Pensacola find the bodies of an elderly woman and her two adult sons beaten, stabbed and covered in blankets inside her home. With the community on edge, authorities wonder if they have a Satanic killing on their hands.

In 1999 a family of five vanishes from their home in rural Wisconsin. When remains are discovered in their burned-out car, the community is on edge with rumors of occult killers, while the investigation leads to a shocking and sinister conclusion.

After the bodies of an Ohio mother and her two daughters are found in the Tampa Bay waters in June of 1989, detectives launch a multiyear, painstaking investigation that finally leads them to an elusive and unexpected killer.