When Nikki Halpin, a divorced mother of 2, is brutally beaten at home in front of her children. She was found barely alive, but later died at the hospital. The residents of Safety Harbor, FL are terrified that a violent intruder is on the loose. But when a mysterious voice on the 911 recording reveals an eerie clue, detectives zero in on an unlikely suspect.

When the Korean-American Chae family is terrorized in their suburban home in 2009 in North Wales, PA, only three survive. Local investigators wonder if this is a robbery gone wrong or something more. As the case unfolds, police are shocked to learn of the betrayal behind the murder.

When 18-year-old Brittany Loritts is murdered in her Salisbury, NC, home in the summer before starting college, investigators are at a loss as to who would commit such a crime. The case gets hot when investigators find that the family home is built on buried secrets.

When 27-year-old divorced father Jarrod Davidson is shot in the doorway of his Santa Barbara apartment, the neighborhood fears there's an assassin on the loose. As detectives dig deeper into Jarrod's past, they find out he got mixed up with the wrong person and a plant left at the crime scene is the key to catch his killer.

Bloomsbury, NJ, is the epitome of small-town America. When Monica Massaro is found viciously murdered in her home with her throat slashed, it rocks this town to its core. A tip comes in from 300 miles away to help police hunt down the killer, and the results leave residents shaken.

When single mom Norma Rodriguez's murder in 1993 hits the town of Port Hueneme, CA, police are left sorting out the suspects in its wake. It will take a capricious witness and 10 years to clean up the damage. When the dust finally settles no one is more surprised than the killer.

22-year-old college student Katie Sepich disappears one night only to be found raped, murdered and set on fire in a landfill the next morning. It's a case that leads Las Cruces, NM, detectives from the victim's inner circle to a potential serial killer and then back to their own front door.