[The Hunt for the Original Night Stalker] In the 1970s a serial rapist is on the loose in northern California; then, as his reign of terror over the community wanes, police discover he isn't just a serial rapist, he's a serial murderer and he's been killing people all over California.

[Every Parent's Worst Nightmare] A young couple's toddler vanishes while the family is enjoying an impromptu camping trip in Leadore, Idaho; investigators and private detectives work around the clock to find the missing boy, only to come back to his parents.

[The Petit Family Tragedy] One summer night in 2007, the Petit family is woken up by two strangers in their quiet Connecticut home; suddenly, these four family members find themselves being held hostage and in a fight for their lives.

[A Nurse's Mysterious Murder] Sherri Rasmussen and John Ruetten are enjoying newlywed life until one morning when Sherri calls into work sick; that night, John returns home to find his wife murdered; years later, detectives discover Sherri's killer was too close for comfort.

[Who Killed the Coulthurst Family?] A premiere fishing boat explodes into flames just off shore, stunning the small fishing town of Craig, Alaska; after fighting the flames, state troopers discover the remains of a young family and few clues as to could have set the ship blaze.

[Justice for Dan Markel] In Florida, friends and family are stunned after an esteemed criminal law professor is executed in his garage; investigators follow a series of leads taking them on a statewide hunt in search of the murderous masterminds.

[South Carolina Body Count] After a young couple goes missing, detectives find a clue leading them to a strange storage container in the middle of 95 acres, and what's inside unlocks the secrets of a monster hiding in plain sight.

[Teenage Murder] In 1984, the body of a 14-year-old girl turns up on the beach in San Diego and police think it relates to the murder of another teen; a clue yields an unbelievable suspect.

[Who is Edward Wayne Edwards?] In 1980, Tim Hack and Kelly Drew go missing from a small Wisconsin town, then their bodies are found in a field; a woman comes forward nearly 40 years later to help solve the so-called "Sweetheart Murders" of Hack and Drew.

[Grieving Fianceé or Cold-Blooded Killer] Shock sweeps through a Washington community when a suburban mother gets arrested for a murder from a decade earlier in Alaska; details of a seedy and sordid past emerge.

[A Family Shattered] Police investigate the shooting deaths of millionaires Brad and Andra Sachs in their home in 2014 and track a series of clues in a chase to find the couple's killer.