In 2022, a disturbing discovery on the Stuart Highway left Northern Territory police with more questions than answers.

A human leg had been found beside the highway, but police didn’t know who it belonged to, what had happened, or whether there was a missing person somewhere out there.

What followed was an investigation that slowly pieced together the events of one night — a crash, a decision not to call police, and an attempt to conceal what had happened.

In this episode, I take you through the events leading up to the crash, the investigation that eventually uncovered the truth, and the very different roles played by Joshua Mason and his mother, Deborah.

I also look at their lives before the offending, the circumstances surrounding their decisions that night, and what the judge considered when sentencing them.

This ...