The apartment was locked. Outside, snow was falling across Philadelphia. Inside, 27-year-old Ellen Greenberg lay dead on her kitchen floor.

She had 20 stab wounds to her body. What happened next would spark a debate that has lasted more than a decade. Investigators changed their conclusions, forensic experts disagreed, and Ellen's parents began a relentless fight to uncover the truth.

What really happened to Ellen Greenberg? Was this a tragic suicide, or does one of America's most baffling death investigations still have crucial questions left unanswered?

A hundred miles an hour. No skid marks. No attempt to brake.

In the early hours of a summer morning in Strongsville, Ohio, a car carrying three young people slammed into a brick building with devastating force.

At first, people assumed it was a tragic accident. But as investigators dug deeper into the wreckage, examined phone records, and uncovered the turbulent relationship at the middle of the case, a far darker picture began to emerge.

was this a catastrophic mistake... or cold blooded murder?

She was 19 years old, ambitious, bright, and stepping into what should have been the beginning of her life. But after a first date on a spring evening in Milwaukee, Sade Robinson vanished without a trace.

She left behind a trail of disturbing clues that would unravel into one of the most horrifying murder investigations the city had seen in years..

On a warm Sunday morning in rural Ballarat, a mum of three laced up her running shoes, and stepped outside for what should have been a normal run. And then vanished without a trace.

She knew the bushland like the back of her hand. So how the hell did she fall off the face of the earth?

The trail abruptly ended, and the mystery gripped Australia. This is the chilling case of Samantha Murphy.

In Apple Valley in 2010, 4 people suddenly disappeared off the face of the earth. This kind of thing was unheard of in this small community.

And when police discovered a house soaked in blood, time started ticking.

A race against the clock.. track down the man responsible, and find the victims.. alive.. or dead.

What could be more terrifying in a small town than 3 members of a family completely vanishing off the face of the earth? How about when the neighbour vanishes too..

Four missing people, a house soaked in blood, drag marks along the floor.. and an eerie CCTV clip..

In Apple Valley in 2010 it was a race against the clock.. track down whoever was responsible for this terrifying quadruple disappearance, and find the victims.. alive.. or dead.

It’s been 7 years since Paige Coffey vanished without a trace.

The Bratenahl Police Department told us.. ‘Paige could be sitting on a sunny beach somewhere for all we know’

But now, a tragic update. Her remains have been found..

Lets dive back in to the unsettling case of Paige Coffey

26th April 1986 started as a normal quiet evening in the town of Pripyat, in the Soviet Union. Families settled themselves into bed, having no idea that a silent deadly poison would soon fill their city. As they closed their eyes that night they never expected to wake to a catastrophic horror. The worst nuclear disaster in the history of the world.