The tragic murder of a 14-year-old girl in Michigan leaves behind little physical evidence, forcing investigators to enter the digital world in search of clues.

52-year-old Cole Cannon was found dead in his trailer when it caught fire in Lawrence County, Alabama. Cole's children discuss their search for the truth.

A sniper shooting on an Alaskan highway leaves a young man dead and a community running scared. As one family grieves, another becomes hell-bent on revenge.

In Liverpool, new recruit Chico finds a huge stash of cannabis up an alleyway, helping his handler PC Bartley disrupt a major drugs operation.

Detective Derrick Levasseur and Dr. Kris Mohandie investigate unsolved murder cases. They re-examine old evidence and new clues and try to finally solve these crimes.

In 2013, 51-year-old Robin Pope's body was washed ashore just one mile from her ex-husband's home. Did she drown, or was this a malicious act by her ex?

In 2013, beloved basketball coach Jimmy McClain is found brutally murdered. With no signs of forced entry, police fear that Jimmy knew the killer.

When Cody MacPherson moves to New Jersey seeking work, he disappears after a night of partying with a new group of friends. It becomes a homicide investigation.

A sniper shooting on an Alaskan highway leaves a young man dead and a community running scared. As one family grieves, another becomes hell-bent on revenge.

A killer guns down a rapper outside a New Orleans Waffle House. A string of robberies in Arkansas baffles police until they use video to catch the robbers.

Online, Stephanie is building a brand as a bespoke makeup artist. But offline, her life spirals when she vanishes into thin air on Halloween Eve.

Customs officers have to climb a perilous 30-metre ladder to search a massive vessel. And, officers uncover over 100 cigarette packs hidden in a car.

In Dorohusk, customs officers conduct a detailed search of a busy train. Meanwhile, a sniffer dog helps to thwart two cigarette smugglers in Korczowa.

In Texas police set a trap for a would-be killer. In Florida, a high-speed chase leads police into a dangerous swamp, and the arrest turns into a rescue.

A local deputy attempts to save a woman trapped in her burning home. Plus, a trainee officer finds himself in the middle of a high-speed pursuit.

When bodies show up across California, investigators realise they are searching for a serial killer. The suspect keeps a macabre audio diary of his attacks.

A mother-of-two vanishes from her home in Utah in 2009. As police investigate, dark family secrets emerge, and a tragedy follows that no one saw coming.

Elizabeth Chambers investigates the red flags that surround the tragic relationship between a Virginia Lacrosse player and her boyfriend.

A woman tries to leave her abusive husband but must still see him for their kids. On a visit to his remote mountain home, she finds there's no escape.

A suspected home invasion in Connecticut leaves a mother dead in the basement and her husband injured. Detectives learn there's more to the story.

In the 1970's, Anneka Di Lorenzo found fame as a successful model in Penthouse Magazine. However, from that point, her life unravelled with tragic consequences.