Being one of Australia’s cutest animals hasn’t prevented its slide towards extinction. 

Reporter Rachael Brown investigates what is being done to try to curb the koala's declining population.

Will any koalas be left in Australia's east by 2050?

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"Simone" arrived on a remote island to help asylum seekers. But she witnessed something there that convinced her to leak over 2000 documents. Reporters Paul Farrell and Maddison Conaughton investigate what happened.

The whistleblower who exposed Australia’s secretive offshore detention system

When patients start unexpectedly dying at a regional hospital, nurse Toni Hoffman takes a big risk to blow the whistle on a negligent surgeon. But years later, it's still unclear why she was ignored for so long.

The Whistleblower who brought down Australia's Dr Death

Kathy Jackson was once heralded as a revolutionary who shone a bright spotlight on union corruption but she too was later found to be a fraudster who had misappropriated hundreds of thousands of dollars in union members' money. So who was the man responsible for blowing the whistle on her? 

Reporter Annika Blau investigates.

The whistleblower who captured the nation — and the man who unmasked her as a fraud

When an electoral officer helps police arrest a popular politician, her life begins to unravel. Her boss would spend more than a decade in prison, but she loses her job, and is even eventually admitted to a mental health institution. Now she’s asking: could he have been stopped earlier? Reporter Tynan King investigates.

The whistleblower who helped catch a paedophile politician

What happens when a person blows the whistle on wrongdoing?

Will any koalas be left in Australia's east by 2050?

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