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.