Season 5 - Episode Guide

Ray and Jennie Kehlet set off for a prospecting trip to the WA outback in March 2015. Their adventure turned into a tragedy, with Ray killed and Jennie still missing. Under Investigation hears new evidence in this baffling mystery.

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

One of the world's most unforgivable legal scandals. How South Australia's Chief Forensic Officer operated for decades with barely a qualification, giving evidence in 400 criminal cases that saw innocent people imprisoned.

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. How will Australian police deal with this new and growing threat?

When one of Australia's most senior police officers was killed in his own driveway they suspected a professional hit. Investigators jailed and then freed another man. So who killed Colin Winchester? Was it the mafia?

Richard Dorrough, ex-navy sailor, took his own life in 2014. He left behind a shocking note, claiming to have murdered three people. But with no names, dates or details, no one knew who the victims were...until now.

Liz Hayes and her team of investigators probe the mystery gripping Australia and the world. Three dead, another clinging to life, after a mushroom lunch in small-town Victoria.

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.