On last week's episode, we spoke with Nicole Morris, the director and founder of the Australian Missing Persons Register, about her new book, Missing.

Nicole described one of those cases as very solvable, and in this episode of Australian True Crime, we find out why.

Western Australian man, Rigby Fielding was already retired at 53 years of age after a successful career as a restaurateur. He decided to move back to his childhood home in Rockingham, half an hour south of Perth, to live with and care for his elderly mother and his younger sister, who lives with Down Syndrome.

Rigby, known as Rig, traveled by train to Perth on August 15, 2015 to visit friends. He called his mother in the afternoon to let her know he was heading home, but he never made it and that was the last known contact he had with anyone. Since that day, Rig's sister, Stephenie, has devoted herself to finding him and she joins us on Australian True Crime to share her story.