On a scratchy recording made in a Melbourne hotel room, a man admits to committing murder. But as journalist Alicia Bridges investigates the man on the tape known as Mr Big, she finds herself in a world of lies and subterfuge, where very few things are as they seem. The recording leads her deep inside an international controversy, to a world of secrets that powerful institutions don't want revealed.

Mr Big is the latest season of Unravel, the ABC's award-winning true crime podcast.

You can listen to the entire season now by searching for Unravel.

More information

Host and Reporter: Alicia Bridges

Supervising Producers: Yasmin Parry and Alex Mann

Producer and Researcher: Ayla Darling

Theme: Martin Peralta and Ashley Cadell

Sound Design: Hamish Camilleri

Executive Producer: Tim Roxburgh

Manager of Podcasts at ABC Audio Studios: Monique Bowley.

Victoria Police is set to announce a one million dollar reward for information that finally solves the case of Maria James, who was murdered in the back of her bookshop 44 years ago. And for the first time in seven years of investigating this case, police grant an interview to Rachael Brown.

A Victorian Coroner has failed to name a killer in the 1980 cold case of Maria James. Her sons are devastated. But there's still hope, in leads yet to be chased by police.

The new coronial inquest into the murder of Maria James has wrapped up. Will the Coroner be able to name her killer? And of the police exhibits that haven't disappeared, what DNA testing can be done? This episode nears us closer to the end of the James brothers' 41-year-fight for answers for their mum.

The discovery of a police exhibit - thought to be missing for around three decades - could finally help unmask the killer in the 1980 cold case of Maria James.

The Royal Commission has released its final report into defence lawyer turned police informer Nicola Gobbo.