When a California mother of two is stabbed to death in her bedroom, police can't find any incriminating evidence. The case goes cold for years until a new detective uncovers a tiny clue that leads to an undercover sting to catch the killer.

A small town is left on edge when a young mother is murdered inside her home. An early arrest and later, a surprising confession, point to a dark conspiracy and leads investigators to someone many people thought they knew.

On an Easter Sunday, 18-year-old Heidi Allen vanishes from her convenience store job. Two brothers are arrested for the kidnapping, but only one is convicted. Years later, a chilling new story emerges implicating three other men in the crime.

Margaret Purk is just days away from having her first baby when, after an apparent suicide by hanging, she and her unborn son are dead. Twenty-four years later, new clues lead investigators to re-open the case. Was this suicide actually a homicide?

In St. Petersburg, FL, Cabretti Wheeler and his friend Kyle Ellis are killed.  When the only eye-witness vanishes, it's up to Cabretti's mom, Lisa Wheeler, to help police solve the case, even if it means risking her own life for justice.

When a young husband is thrown in jail for the murder of his newlywed wife, most people in their small Oklahoma community believed the case was solved. But odd cell tower records and surprising DNA evidence force investigators to take a second look.

Teenagers Rebecca Bender and Bekah Charleston fall for men who seem to care about them. Instead, the girls are lured into human trafficking and coerced into prostitution.

When a paramedic and mother is found dead and covered in paint in the basement of her Massachusetts home, investigators must work tirelessly for 18 months to find the person responsible.

Life is good for 12 year-old Garrett Phillips, until he's brutally attacked while home alone. His killer jumps unseen from a window and investigators are left with a vexing mystery that rattles the otherwise peaceful village of Potsdam, NY.

On Florida's Gulf Coast, young father Terrance Williams vanishes without a trace; Terrance's mother finds out that the last person to see her son before he disappeared has a curious connection to another man who went missing from the same town.