"The Queen is dead, long live the King" will be the words echoed the instant Her Majesty Queen Elizabeth II passes. UI investigates The Crown in a post-Elizabeth world.

UFOs - A topic previously pushed into science fiction is suddenly being taken very seriously based on an extraordinary video, taken, and authenticated by the US Military.

Following the ground-breaking investigation that examined the disappearance of elderly lovers Russell Hill and Carol Clay, from their remote campsite in Victoria's High Country.

UI re-investigates the baffling case of Melbourne's "Mr Cruel" that involved a series of child abductions and murder during the late-1980's.

UI investigates Australia's delicate dance with nuclear energy, which many experts say is our only way of surviving past fossil-fuels into a carbon-free future.

Not since Adolf Hitler has the world feared a dictator like Vladimir Putin. Hitler's madness sparked a World War - could Putin do the same?

Liz Hayes and Under Investigation's formidable experts investigate the strange death of a top SA cop in 1981. Written off as suicide for decades, compelling new revelations point to a sinister plot to kill the decorated detective.

In the 1980's and 90's, Sydney's gay community fell victim to ruthless bashings by savage gangs. Now, Under Investigation can reveal the role played by the NSW Police Force.

After over a dozen killings in 18 months, Sydney's gangland wars are getting bloodier. Under Investigation pulls back the curtain on the city's dark underbelly.

Between 1970 and 2018, 11 people have vanished or been murdered along the Flinders Highway, including missing backpacker Tony Jones. Under Investigation pieces together his final hours.

Travellers onboard cruise ships have seen violent crime, pollution, and now a COVID crisis. Liz Hayes and a panel of experts examine whether it has learnt from past lessons.

Nearly 50 years ago, 11-year-old Joanne Ratcliffe and 4-year-old Kirste Gordon were snatched from the Adelaide Oval. Groundbreaking new technology helps identify their kidnapper and reveal a shocking twist.

Uncover the terrifying abuse faced by young, vulnerable women at the hands of the Esther Foundation, a Perth cult once backed by some of the most powerful leaders in the country.

After government inspectors found a slug in a Melbourne catering company's factory, a public health warning erupted into a bitter brawl between a David and a Goliath.

Loving couple Ray and Jennie Kehlet join colleague Graham “Grumpy” Milne on a gold-prospecting trip to the red heart of Western Australia. Three people go out but only one comes back. Then a body is found in a remote mineshaft. With a senior member of the police investigative team joining our panel of UI experts, the case is laid open as never before.

Australia's first celebrity chef, star of radio and television Willi Koeppen, runs one of the country's most successful restaurants before he vanishes without a trace in 1976.

One of the world's most unforgivable legal scandals. How South Australia's Chief Forensic Officer operated for decades with barely a qualification, providing false evidence.

Australia's most baffling maritime mystery, the 1988 disappearance of the Patanela just 10 miles off the coast of Sydney. No distress call. No debris. All four on board lost without a trace. What really happened to the Patanela?

He was brave enough to stand up to the mafia in a country town. But Don Mackay paid the ultimate price. His enemies weren't just mafia living by the creed: You speak, you die. He was also facing a political insider.

Four young police officers sent to a rural property are ambushed by violent extremists. They faced the siege at Wieambilla - the point when conspiracy became violence.

One of Australia's most senior officers was killed in his own driveway they suspected a professional hit. Investigators jailed and then freed another. Who killed Colin Winchester?

Richard Dorrough, ex-navy sailor, took his own life in 2014. He left behind a shocking note claiming to have murdered three people, but no details to identify the victims.

Liz Hayes and her team of investigators assemble formerly top-secret diplomatic documents to expose what really happened to the Balibo Five, a team of Australian journalists executed in East Timor. Their deaths mark the beginning of a shameful government cover-up that continues tonight.

While searching for a snake in her garage, a devoted mother is fatally shot in the back by her husband. Liz and her team of experts examine the events surrounding that night.

When a 12-year-old Queensland girl was brutally killed, her sister's boyfriend Graham Stafford was almost immediately convicted with her murder. Liz Hayes and her team of experts examine the flawed investigation and a shocking miscarriage of justice.

Sandrine Jourdan was a vivacious mother of three living in the small town of Caboolture until she mysteriously vanished in 2012. Liz Hayes and her team of experts raise serious doubts about the official narrative.

It is every family’s nightmare. A mother goes out on her regular morning jog, and never returns. In a special edition of Under Investigation on Wednesday night, Liz Hayes and a team of experts travel to the Victorian regional city of Ballarat to delve into the mysterious disappearance of 51-year-old Samantha Murphy.

Former WA cop Adrian Moore exploited his authority and the trust vested in police to manipulate, rape, and abuse thirteen women over a decade before being convicted in 2022.

China's authoritarian government is quietly developing AI designed to control its citizens. Liz Hayes and her team investigate just how far China's silent invasion will go.

Supposedly safe in witness protection, Andrew Petrelis, the star witness in a $40 million dollar drug importation is found dead. His death is deemed a tragic drug overdose.

The shooting of Kumanjayi Walker by former NT police officer Zachary Rolfe in 2019 sparked one of the most contentious and racially-charged criminal sagas in Australian history.

The body of 15-year-old Eden Westbrook is found hanging from a tree in a public park. Liz Hayes and the panel discover serious flaws in the police investigation.